straight face noun
plural straight faces
plural straight faces
Learner's definition of STRAIGHT FACE
[count]
: a face that shows no emotion and especially no amusement严肃的表情；绷着的脸 -
She lied with a straight face.她说谎的时候一脸正经。
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It was hard to keep a straight face. [=to not laugh or smile]很难忍住不笑。
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The students quickly put on straight faces as the teacher walked into the room.老师一走进教室，学生们迅速装出一本正经的样子。
— straight-faced
/ˈstreɪtˈfeɪst/ adjective