Blackjack Glossary: Every Term & Definition Explained

Blackjack has a vocabulary of its own, and knowing the terms makes the game easier to play and the strategy easier to follow. This glossary covers every term you are likely to encounter across the blackjack hub, from basic gameplay actions like hit and stand to advanced concepts like ENHC, true count, and soft 17. Use it as a quick reference whenever you come across a term you do not recognise.

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21+3 — A side bet combining the player’s two cards and the dealer’s upcard to form a three-card poker hand. 21+3 qualifying hands include flush, straight, three of a kind, straight flush, and suited three of a kind. Payouts vary by combination, with the rarest hands paying up to 100:1.

D

DAS — Short for Double After Split. This is the rule that allows a player to double down on a hand created by splitting a pair. DAS is not available at every table, and where it exists it lowers the house edge by roughly 0.13%.

Double Down — Doubling the original bet in exchange for exactly one additional card. The turn ends automatically after the card is dealt. Most tables only allow doubling on the first two cards, and some restrict it to specific totals like 9, 10, or 11. There's specific math around the best time to Double Down.

F

Flat Betting — Placing the same bet amount on every hand, regardless of previous results. Flat betting is the simplest blackjack betting system and is often recommended for newer players because it removes the temptation to chase losses. It also rules out any progressive system that scales bets based on outcomes.

H

Hard Hand — Any hand without an Ace, or a hand where the Ace must count as 1 to avoid busting. A hard 16, for example, is one that cannot benefit from counting an Ace as 11 because doing so would push the total over 21. Hard hands are more likely to bust on a hit than soft hands of the same total.

Hit — Request an additional card from the dealer. You can keep hitting until you stand, bust, or hit 21. In a live setting, players signal a hit with a specific hand gesture.

Hole Card — The dealer’s face-down card, dealt second and not revealed until all players have acted. The hole card exists in American-style blackjack games where the dealer checks for blackjack before play continues. European-style games (see ENHC) do not deal a hole card at all, which is one of several format-level blackjack variations worth knowing.

House Edge — The mathematical advantage the casino holds over the player, expressed as a percentage. In blackjack played with correct basic strategy, the house edge sits below 0.5% in most standard games. Rule variations like 6:5 payouts, soft 17 rules, and deck count all shift the figure.

R

RNG — Random Number Generator. The software used in non-live blackjack to determine the order and value of cards dealt. Certified RNGs ensure each card is statistically random and independent of previous hands. RNG games typically shuffle every hand, which removes any opportunity for card counting and is one of the key differences in online vs traditional blackjack. RNG tables are also where free blackjack practice is available.

Running Count — In card counting, the cumulative count of cards seen since the last shuffle. Cards are assigned values (commonly +1, 0, or -1 in the Hi-Lo system) and added or subtracted as they appear. The running count is divided by decks remaining to produce the true count.

S

Shoe — The device that holds and dispenses multiple decks of cards at the table. Most blackjack tables use shoes containing 4, 6, or 8 decks. The number of decks affects the house edge slightly, with fewer decks generally favouring the player.

Soft Hand — Any hand containing an Ace counted as 11. For example, an Ace plus a 6 is a soft 17. Soft hands cannot bust on the next card, since the Ace can drop to 1 if needed. This makes them more aggressive to play than hard hands of the same total.

Soft 17 — A specific soft hand of Ace plus 6, totalling 17 with the Ace counted as 11. Soft 17 is the centre of a key dealer rule variation: some tables require the dealer to hit on soft 17 (H17) while others require standing (S17). H17 raises the house edge slightly compared to S17.

Split — Dividing two cards of equal value into two separate hands, each with its own bet matching the original. The player then plays each hand independently. Most tables only allow one additional card per Ace after splitting Aces, with no further hits.

Stand — Keep the current hand and end your turn without taking more cards. Once you stand, the dealer plays out their hand and the round resolves. Standing is the correct play on any pat hand against most dealer upcards.

Surrender — Give up half your bet and fold the hand without playing it out. Blackjack surrender is available as either early or late depending on the table rules, and it is not offered at every table.