Odds | The probability of making a hand versus the probability of not making the hand.
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Offsuit | Two different suits, used to describe the first two cards.
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Omaha | A flop game similar to Hold 'Em, but each player is dealt four cards instead of two, and a hand must be made using exactly two pocket cards, plus three from the table.
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On Board | On the table; in the game.
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On The Come | A hand that is drawing to a straight or flush.
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On Tilt | Playing poorly, usually because of becoming emotionally upset.
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One-Gap | An inside straight.
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Open | To make the first bet.
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Open-Ended Straight | Four consecutive cards requiring one at either end to make a straight.
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Open Card | Exposed card; a card dealt face-up.
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Open Pair | An exposed pair; a pair of face-up cards.
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Open Poker | Games where some of the cards are dealt face up.
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Option | When a player posts a live blind, that player is given the option to raise when their turn comes around, even if no one else has raised; straddle.
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Out | A card remaining in the deck that could hopefully improve your hand.
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Outdraw | To beat an opponent by drawing to a better hand.
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Outrun | Outdraw.
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Overcall | To call a bet after another player has already called.
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Overcard | In stud games, a card higher than your opponent's probable pair; in flop games, a card higher than any card on the board.
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Overpair | In flop games, a wired pair higher than any card on the board.
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