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English definition of “straight face”

straight face

noun [C usually singular] uk   us  
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.
(Definition of straight face from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of straight face?
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