- an expressionless face: He can tell a funny story with a poker face.
- a person who has or deliberately assumes a poker face: It is impossible to tell what that poker face is really thinking.
Origin of poker face
- informal a face without expression, as that of a poker player attempting to conceal the value of his cards
Idioms and Phrases with poker face
A visage lacking any expression that can be interpreted, as in Whenever Betty attended one of her children's performances, she managed to keep a poker face. This term alludes to the facial expression of a poker player who is expert at concealing his feelings about his hand. [c. 1880]