Glossary
Speak the language of probability.
Accumulator (Parlay)
A single bet that links together two or more individual wagers and is dependent on all of those wagers winning together. The odds multiply, increasing payout and risk. Use our Sports Betting Calculator to calculate parlay payouts, and our Odds Converter to understand how decimal odds multiply.
Arbitrage
A betting strategy where you place bets on all possible outcomes of an event at odds that guarantee a profit regardless of the result. Also known as "arbing" or "sure bets." Bookmakers generally discourage this practice.
Bankroll
The total amount of money a player has set aside specifically for gambling. Proper bankroll management — deciding how much to bet per session — is essential for long-term survival in any game of skill or chance.
Bluff
A bet or raise made with a weak hand, designed to make opponents fold stronger hands. A core strategy in poker. A semi-bluff is a bluff made with a hand that has potential to improve on later streets (e.g., a flush draw).
Equity
Your "fair share" of the pot based on the current probability of winning. Example: If the pot is $100 and you have a 60% chance to win, your equity is $60. Use our Texas Hold'em Calculator to calculate equity in real-time.
Expected Value (EV)
The predicted value of a variable, calculated as the sum of all possible values each multiplied by the probability of its occurrence. In betting: Is this bet profitable in the long run? Read our guide: What is EV?
Fold Equity
The additional equity a player gains from the chance that their opponent will fold to a bet. Even if you are behind in the hand, a well-timed bet can win the pot if your opponent folds often enough. This is a key concept in tournament poker.
Handle
The total amount of money wagered by all bettors on a particular event or at a particular sportsbook over a given period. A $10 million handle means $10 million was bet in total, not the profit or loss.
Hand Range
The complete set of possible hands an opponent might hold based on their actions. Instead of trying to guess one specific hand, skilled players think in ranges — e.g., "they could have any pocket pair, AK, or AQ." Narrowing your opponent's range is a key skill in poker.
Hedge
A bet placed on the opposite side of an existing wager to reduce risk or lock in a profit. For example, if you bet on Team A to win the championship early in the season, you might hedge by betting on Team B in the final to guarantee a payout regardless of the outcome.
ICM (Independent Chip Model)
A mathematical model used in poker tournaments to convert chip counts into real-dollar equity. In a tournament, the value of each chip decreases as you accumulate more — the 100th chip is worth less than the 1st. ICM helps players make optimal decisions about when to risk their tournament life.
Implied Odds
An extension of pot odds that accounts for the additional money you expect to win on future streets if you hit your draw. While pot odds only consider the current pot, implied odds factor in potential future winnings, making them especially relevant in deep-stacked cash games.
Kelly Criterion
A formula for determining the optimal size of a series of bets to maximize long-term bankroll growth. The formula is: f* = (bp - q) / b, where b is the odds received, p is the probability of winning, and q is the probability of losing. Many professional bettors use "fractional Kelly" (half or quarter) to reduce variance.
Outs
The number of remaining cards in the deck that will improve your hand to (likely) the winning hand. For example, if you have a flush draw on the flop, you have 9 outs (13 spades minus the 4 you can see). Counting outs is the first step in calculating pot odds.
Overlay
When the total prize pool in a tournament or contest exceeds the total amount collected from entry fees. This represents positive expected value for participants. In daily fantasy sports, an overlay means the guaranteed prize pool is larger than what entries cover — a rare opportunity for +EV play.
Position
Where a player sits relative to the dealer button in poker. Late position (acting last) is advantageous because you get to see what other players do before making your decision. Early position (acting first) is the most difficult spot. Position is one of the most important strategic concepts in poker.
Pot Equity
See Equity. Your share of the pot expressed in dollars based on your probability of winning at that moment.
Push / Shove
To go all-in in poker. "Push" and "shove" are slang terms for betting all your remaining chips. In tournament play, push/fold strategy becomes critical when stacks are short — you either shove all-in or fold, with no middle ground.
Semi-Bluff
A bet or raise made with a hand that is currently behind but has a good chance of improving to the best hand on later streets (e.g., a straight draw or flush draw). Unlike a pure bluff, a semi-bluff has two ways to win: your opponent folds, or you hit your draw.
Steam
A sudden, impulsive series of bets or raises, usually triggered by a bad beat or a losing streak. Steaming is closely related to tilt and is one of the most bankroll-destructive behaviors in both poker and sports betting. Setting stop-loss limits is the best defense.
Tilt
A state of emotional frustration that leads to suboptimal decision-making. On tilt, players make larger bets, play weaker hands, or deviate from their strategy. Tilt is the #1 enemy of profitable poker players. Learn more in our article: The Psychology of Chasing Losses.
Variance
A measure of how far a set of numbers is spread out from their average value. In gambling, high variance means large swings (winning big or losing fast), while low variance means steady, smaller results. Even +EV players can experience long losing streaks due to variance. Use our Expected Value Calculator to see how variance affects long-term profitability.
Vig (Juice)
The commission charged by a bookmaker on a bet. For example, standard NFL bets require you to risk $110 to win $100 on either side — the extra $10 is the vig. It's how sportsbooks make their money regardless of the outcome. Lower vig means better value for the bettor. Use our Sports Betting Calculator to see how vig affects your payouts.
Weak Ace (AXs)
In Omaha and Hold'em, a hand like A2s, A3s, etc. — an ace with a small suited kicker. These hands are valuable because they can make the nut flush and the nut straight (the "wheel": A-2-3-4-5). However, they can also make second-best flushes and straights, leading to costly mistakes.
Zero-Edge Game
A game where the house edge is 0% — the player has no mathematical disadvantage. True zero-edge games are extremely rare in casinos. Some video poker machines with perfect strategy and promotional pay tables can approach zero edge, but most casino games have a built-in house advantage.