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straight face

noun [C usually singular]
 
 

Definition

a serious expression on your face that you use when you do not want someone to know that you think something is funny: Brian looked ridiculous in leather trousers, and I was desperately trying to keep a straight face.Not showing or feeling emotionsControlling emotions
(Definition of straight face noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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