poker face

noun
1.
an expressionless face:
He can tell a funny story with a poker face.
2.
a person who has or deliberately assumes a poker face:
It is impossible to tell what that poker face is really thinking.
Origin
1880-85, Americanism
Related forms
poker-faced, adjective
British Dictionary definitions for poker face

poker face

noun
1.
(informal) a face without expression, as that of a poker player attempting to conceal the value of his cards
Slang definitions & phrases for poker face

poker face

noun phrase
  1. An expressionless face; neutral mask; deadpan
  2. A person whose face is usually expressionless (1885+)

Idioms and Phrases with poker face

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 ]