What does the idiom wore a poker face mean?

what does poker face mean
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A face on a person that shows no emotion, often called poker face because in the game of poker it would be foolish to show any emotional traits that might

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what is nvme slot In the workplace, maintaining a poker face means regulating your emotions so your facial expressions and body language, including vocal tone

what is the federal tax rate on lottery winnings A “poker face” refers to a facial expression that doesn't reveal any emotion, especially in situations like playing poker where it's essential not to show any