Poker-face meaning

A face lacking any interpretable expression, as that of an expert poker player.
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An expressionless face, as of a poker player trying to conceal the nature of his or her hand.
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(poker) An impassive facial expression cultivated to prevent other players from determining whether one's actions in the game are the result of a quality hand, or of bluffing.

Though he thought he had a perfect poker face, he had a number of tells his opponents soon learned.

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Any similar expression used to prevent giving away one's motives, feelings, or situation.
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