The first time I heard someone say “color up” at a blackjack table, I thought they were talking about their outfit. Turns out they were asking the dealer to swap their pile of $5 chips for a couple of $100s. Blackjack has its own language, and if you don’t speak it, the table can feel like a foreign country.
This glossary covers every term you’ll encounter — at a live casino table, in an online game, or while reading any of our strategy guides. We’ve organized it alphabetically, kept each definition short and practical, and linked to deeper articles when a term deserves its own page.
Bookmark this. You’ll come back to it.
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How to use this glossary
- Jump to a letter using the quick links below
- Each definition is 1–3 sentences — enough to understand the term in context
- Bold terms within definitions have their own entries in this glossary
- Links point to our in-depth guides when a term has a full article behind it
Quick navigation: A · B · C · D · E · F · H · I · K · L · N · P · R · S · T · U · V · W
A
Ace — The most versatile card in blackjack, worth either 1 or 11 depending on which value helps the hand. An Ace paired with a 10-value card on the first two cards creates a natural blackjack. See our card values guide for a deeper explanation.
Action — The total amount of money a player has wagered. If you play 100 hands at $10 each, your action is $1,000 — regardless of whether you won or lost.
Anchor — The player sitting in the last seat at the table (the dealer’s far right), also called third base. This player acts last before the dealer. Despite what some people believe, seat position has no effect on your odds — that’s a common myth.
B
Bankroll — The total amount of money a player has set aside for blackjack. Good bankroll management — knowing how much to bring and when to stop — is one of the most important skills outside of strategy itself. We cover it in our bankroll management guide.
Basic strategy — The mathematically optimal decision for every possible hand combination, calculated through billions of computer simulations. Using basic strategy reduces the house edge from ~4% to roughly 0.5%. It’s the foundation of everything. See our complete basic strategy guide.
Blackjack (hand) — A two-card hand totaling 21: an Ace plus any 10-value card (10, Jack, Queen, or King). Also called a natural. At a proper table, it pays 3:2.
Blackjack (game) — The casino card game also known as 21 or twenty-one. Players compete against the dealer, not each other. The game’s history dates back to 18th-century France.
Burn card — The first card the dealer discards face-down after shuffling. This prevents anyone from knowing the identity of the first card in the shoe.
Bust — Going over 21. When a player busts, they lose immediately — even if the dealer would have busted too. When the dealer busts, all remaining players win. Understanding bust probabilities is central to good strategy.
Buy-in — The amount of cash you exchange for chips when you sit down at a table. Place your cash on the felt (never hand it directly to the dealer), and the dealer will give you the equivalent in chips.
C
Card counting — A legal strategy where players track the ratio of high cards to low cards remaining in the shoe. When the deck is rich in 10s and Aces, the player has a statistical advantage. Not illegal, but casinos can ask you to leave. Full breakdown in our card counting guide.
Chip — A small disc representing money at the casino table. Standard denominations: white ($1), red ($5), green ($25), black ($100), purple ($500).
Color up — Exchanging smaller-denomination chips for larger ones before leaving the table. Considered good etiquette — it helps the dealer maintain their chip tray.
CSM (Continuous Shuffling Machine) — A device that shuffles discarded cards back into the shoe after every hand. This makes card counting impossible. Avoid these tables if you’re a serious player.
Cut card — A plastic card inserted into the shoe by the dealer (or a player) to mark where the shoe will be reshuffled. The depth of the cut card placement is called penetration.
D
DAS (Double After Split) — A rule allowing you to double down on a hand created by splitting a pair. DAS is player-favorable and reduces the house edge by about 0.13%. Most American casinos allow it.
Dealer — The casino employee who deals the cards and manages the table. The dealer follows a fixed set of rules — they have no choices.
Double down — Doubling your original bet in exchange for exactly one more card. You can’t hit after doubling. This is a powerful play when the odds are in your favor (like holding 11 against a dealer 6). Full guide: when to double down.
E
Even money — When a player has a blackjack and the dealer shows an Ace, the player can take an immediate 1:1 payout instead of risking a push. Mathematically, declining even money has a higher expected value — so basic strategy says to skip it.
Expected value (EV) — The average amount you expect to win or lose per hand over the long run. A positive EV means the play is profitable over time; negative EV means it costs you. Every decision in basic strategy is based on choosing the highest EV option.
F
Face card — Any Jack, Queen, or King. All face cards are worth 10 points in blackjack. Combined with the four 10-cards, there are 16 ten-value cards per deck — roughly 30.8% of all cards.
First base — The seat to the dealer’s immediate left. The first base player receives cards first and acts first. Like anchor/third base, seat position doesn’t change your odds.
Flat bet — Betting the same amount on every hand, without variation. The opposite of a progressive betting system.
H
H17 (Hit on Soft 17) — A rule requiring the dealer to hit when they have a soft 17 (Ace + 6). This is worse for the player than S17 by approximately 0.2% in house edge. Check the table felt to see which rule applies.
Hard hand — A hand with no Ace, or where the Ace must count as 1 to avoid busting. Example: 10 + 6 = hard 16. Hard hands are riskier to hit. See our card values guide for the full soft vs hard breakdown.
Hit — Take another card. Signal at a live table by tapping the felt in front of your cards. You can hit as many times as you want, as long as you don’t bust.
Hole card — The dealer’s face-down card. In American blackjack, the dealer checks (peeks at) the hole card for a natural blackjack when showing an Ace or 10. In European blackjack, there’s no hole card until all players have acted.
House edge — The casino’s mathematical advantage over the player, expressed as a percentage. With basic strategy and good rules, blackjack’s house edge is approximately 0.5% — the lowest of any table game. Deep dive: house edge explained.
I
Insurance — A side bet offered when the dealer shows an Ace. You can wager up to half your original bet that the dealer’s hole card is a 10 (making blackjack). Pays 2:1 if correct. The house edge on insurance is approximately 7.4% — always decline it.
K
Kelly Criterion — A mathematical formula used to calculate optimal bet sizing based on your edge and bankroll. Used by professional card counters. Related: bankroll management.
L
Late surrender — The option to forfeit your hand and recover half your bet, available only after the dealer checks for blackjack. Available at some Atlantic City and selected online tables. More: insurance and surrender guide.
N
Natural — Another word for a blackjack hand: Ace + 10-value card on the first two cards. A natural beats every other hand, including a dealer’s 21 made with three or more cards.
P
Paint — Slang for any face card (Jack, Queen, King). All “paint” cards are worth 10.
Pat hand — A hand totaling 17 through 21 that a player would normally stand on. A pat hand doesn’t guarantee a win, but it’s strong enough that hitting would be too risky.
Payout — The amount you receive when you win. Standard wins pay 1:1 (even money). A natural blackjack should pay 3:2 at a good table. Avoid 6:5 tables — that single rule change adds ~1.4% to the house edge.
Penetration — How deep into the shoe the dealer deals before reshuffling, usually expressed as a percentage. Higher penetration (75%+) is better for card counters. Most casinos deal 60–80% of the shoe.
Pit boss — The casino supervisor responsible for overseeing a group of blackjack tables (called a “pit”). They handle disputes, approve large transactions, and monitor play.
Push — A tie between the player and the dealer. When both have the same total (and neither has busted), the player’s bet is returned — nobody wins or loses. Pushes occur about 8.5% of the time.
R
Re-split — Splitting again when you receive a card of the same value on a previously split hand. Example: you split 8-8, get another 8 on one hand, and split again. Some casinos limit this to a maximum of four total hands. Re-splitting Aces is often restricted.
RTP (Return to Player) — The flip side of the house edge. If the house edge is 0.5%, the RTP is 99.5% — meaning the game returns $99.50 of every $100 wagered on average. Blackjack has one of the highest RTPs of any casino game.
Running count — In card counting, the ongoing tally of high and low cards dealt. The Hi-Lo system adds +1 for low cards (2–6) and –1 for high cards (10–Ace).
S
S17 (Stand on Soft 17) — A rule requiring the dealer to stand on all 17s, including soft 17. This is better for the player than H17 by approximately 0.2%. Look for “Dealer must stand on all 17s” printed on the table felt.
Shoe — A plastic device that holds multiple shuffled decks (typically 4, 6, or 8 decks). Cards are dealt one at a time from the shoe. “Shoe game” refers to any game dealt from this device, as opposed to a hand-dealt game.
Side bet — An optional wager separate from the main blackjack hand. Common examples include 21+3, Perfect Pairs, and insurance. Side bets almost always carry a higher house edge than the main game — here’s our honest assessment.
Soft hand — A hand containing an Ace counted as 11. Example: Ace + 6 = soft 17. Soft hands can’t bust with one more card, which allows for more aggressive play. Basic strategy treats soft hands completely differently from hard hands. See card values.
Split — Dividing a pair of equal-value cards into two separate hands, each with its own bet. Always split Aces and 8s, never split 10s or 5s. Full decision matrix: when to split.
Stand — Keep your current hand and end your turn. Signal at a live table by waving your hand horizontally over your cards.
Stiff hand — A hard hand totaling 12 through 16. These are the most difficult hands in blackjack because there’s a significant risk of busting if you hit, but standing gives the dealer a strong chance of winning. Knowing how to play stiff hands is the core of when to hit or stand.
Surrender — Give up your hand and forfeit half your bet. Available as early surrender (before dealer checks for blackjack — rare) or late surrender (after — more common). Surrender is correct for certain bad hands like hard 16 vs dealer 10. Details: insurance and surrender.
T
Third base — The last seat at the table (dealer’s far right). Same as anchor. The third base player acts immediately before the dealer. Other players sometimes blame third base for “bad” decisions that affect the dealer’s hand — but this is a myth.
Toke — Casino slang for a tip. Tipping the dealer is customary (but not required) at live tables. A common method: place a chip at the top of your betting circle as a bet for the dealer.
True count — In card counting, the running count divided by the number of remaining decks. This adjustment converts the count into a per-deck value, which is what determines your actual advantage. More: card counting guide.
U
Unit — A standard bet size used as a baseline for bankroll management. If your unit is $10, a “two-unit bet” is $20.
Up card — The dealer’s face-up card, visible to all players. Every decision you make in basic strategy is based on your hand total combined with the dealer’s up card.
V
Variance — The mathematical measure of how much your results swing above and below the expected value. Blackjack has moderate variance — you can easily win or lose several hundred dollars in a session even while playing perfectly. Understanding variance helps you stay rational during losing (and winning) streaks.
W
Wonging — Named after Stanford Wong. The practice of watching a blackjack table without playing, and only sitting down when the card count becomes favorable. Wong published Professional Blackjack in 1975 and his technique became a standard tool for advantage players. More in our history of blackjack.
Terms you’ll see on the table felt
These are printed on the actual blackjack table and tell you the rules before you sit down:
| What it says | What it means | Good or bad? |
|---|---|---|
| “Blackjack pays 3 to 2” | Natural BJ pays 1.5× your bet | Good — always play these |
| “Blackjack pays 6 to 5” | Natural BJ pays 1.2× your bet | Bad — 1.4% more house edge |
| “Dealer must stand on all 17s” | Dealer stands on soft 17 (S17) | Good — 0.2% less house edge |
| “Dealer hits soft 17” | Dealer must hit on Ace+6 (H17) | Bad — slightly worse for you |
| “Insurance pays 2 to 1” | Side bet available vs dealer Ace | Ignore — 7.4% house edge |
| “Double on any two cards” | You can double down on any hand | Good — more options for you |
| “No mid-shoe entry” | Can’t join until the shoe is reshuffled | Neutral — anti-counting measure |
Checking the felt takes five seconds and can save you hundreds of dollars by steering you away from bad tables. For a full breakdown of how rules affect your odds, see our blackjack rules guide.
Frequently asked questions
Do I need to know all these terms to play blackjack? Not even close. You need about 10 terms to sit down and play comfortably: hit, stand, double down, split, bust, push, blackjack, dealer, shoe, and insurance (to know you should decline it). The rest will come naturally. Start with our how to play guide and come back here whenever you hit a word you don’t recognize.
What’s the difference between a “natural” and a regular 21? A natural (or blackjack) is 21 in your first two cards: Ace + 10-value card. It pays a bonus (3:2 at good tables). A regular 21 made with three or more cards pays only 1:1. A natural also beats a dealer’s three-card 21.
What does “the house edge” actually mean in plain English? It’s the percentage of your total bets that the casino expects to keep over time. At 0.5% house edge, the casino keeps about $5 out of every $1,000 you wager. It doesn’t mean you’ll lose exactly 0.5% per session — short-term results vary wildly. Full explanation: house edge guide.
What’s the most important term for beginners to understand? Basic strategy. Everything else — the rules, the odds, the etiquette — only matters if you’re making the right decisions hand by hand. Learn basic strategy and you’ve just eliminated about 90% of the house’s advantage over you.
Practice what you’ve learned
The best way to make these terms stick is to play actual hands. Our free blackjack game uses the same terminology you’ll encounter at any casino — and if you turn on practice mode, the strategy coach will use proper blackjack language to explain your mistakes.
See the full A-to-Z glossary in our reference section for 100+ additional terms, or browse our 50-question FAQ for quick answers to common questions.
And always: play responsibly.
Sources: Wikipedia — Glossary of Blackjack Terms (en.wikipedia.org), Blackjack Apprenticeship — Glossary (blackjackapprenticeship.com), BJ21.com — Glossary of Terms (bj21.com), BlackjackTactics — Blackjack Terms (blackjacktactics.com), William Hill — Blackjack Terms (williamhill.com), PlayOJO — Blackjack Terms (playojo.com), Casino.us — Blackjack Terminology (casino.us), BetMGM — Essential Blackjack Terms (betmgm.com), DeepBlackjack — Glossary (deepblackjack.com), Action Network — Blackjack Glossary (actionnetwork.com)
