Meaning of “straight face” in the English Dictionary

british dictionary

"straight face" in American English

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straight facenoun [ C usually sing ]

us /ˈstreɪt ˈfeɪs/

an expression on your face that shows on emotion in order to hide what you really think or feel:

It’s hard to argue that point of view with a straight face.

(Definition of “straight face” from the Cambridge Academic Content Dictionary © Cambridge University Press)