poker
Poker face
This idiom or expression like phrase refers to:
An emotionless face.
A face with no expression at all.
You can never tell from her poker face if she’s happy or sad or whatever!
History:
This phrase comes from the world of poker. A good poker player has a “poker face,” thus keeping his or her good (or bad) hand a secret.
Poker tells
This idiom or expression like phrase has to do with:
The subtle changes in the behavior and actions of a poker player that result from having a good or bad hand. These twitches, expressions, or mannerisms can reveal or “tell” secrets about what's in the player’s cards and if they are bluffing or truly have a good hand.
I love to play poker with Johnny because I know his tells!
