poker face in Finnish

(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.

(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.

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