Poker face

The phrase "poker face" refers to maintaining an expressionless or unreadable facial expression in order to hide emotions, thoughts, or intentions, especially during situations where deception or bluffing is necessary, as in the card game of poker. It involves keeping a straight face, devoid of any visible signs of excitement, disappointment, or anxiety, to avoid giving away any information that could be used against oneself. The purpose is to confuse opponents and make it difficult for them to accurately assess one's true intentions or the strength of one's hand.