noun
a person's facial expression showing no emotion or amusement
adjective
having a serious or composed expression on the face
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Despite the shocking news, he maintained a straight face during the meeting.
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I couldn't keep a straight face when she told that joke.
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He was trying to act cool, but he couldn't hold a straight face.
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She told such a ridiculous story that I couldn't help but burst out laughing, unable to keep a straight face.