keep a straight face Meaning in the Cambridge English Dictionary
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Meaning of “keep a straight face” in the English Dictionary

"keep a straight face" in British English

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keep a straight face

C2 to ​manage to ​stop yourself from ​smiling or ​laughing: She ​tried to ​keep a ​straight face but, ​unable to ​contain herself, ​burst into ​laughter.
(Definition of keep a straight face from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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