keep a straight face
Meaning
To manage not to laugh, smile, or show emotion, especially in a funny or awkward situation.
Origin
From the idea of a “straight” (unmoving, unsmiling) facial expression—i.e., keeping one’s face neutral. It developed as a figurative way to describe maintaining composure, especially when tempted to laugh.
Notes
Common in speech and writing. Often implies resisting laughter (or hiding feelings) in a humorous, awkward, or inappropriate situation.
Examples
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I tried to keep a straight face when he told the most ridiculous excuse.
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She couldn’t keep a straight face during the prank, and everyone burst out laughing.
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It’s hard to keep a straight face when the kids start making up silly songs.
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The judge managed to keep a straight face, even as the witness gave an absurd answer.
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I had to keep a straight face while reading the script, even though it was hilariously bad.
Grammar & Usage Notes
Usually used with keep/try to keep/can’t keep + a straight face. The article is typically “a” (not “the”). Often followed by while/when + clause.
Synonyms
- keep a poker face
- maintain a neutral expression
- not crack a smile
Antonyms
- burst out laughing
- crack up
- lose composure