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Offsuit - Of different suits.

Openers - A hand with which the betting starts.

Outs - Cards that will improve a hand to win.

Outrun - To beat another hand.

Overcall - To call a bet after one or more others players have already called.

Overcard - A hole card that is higher than any other card on the board.

Overpair - Two hole cards paired and higher than any other card on the board.