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What does "keep a straight face" mean?

keep a straight face text - mp3

keep a straight face

Definition:

to keep someone's face free from laughter

Usage:

informal, conversational

Sample Dialogue:

A: Let's play a trick on Sue. We'll tell her that we won the lottery.
B: She'll believe us. She believes anything.
A: OK. Well, just make sure you keep a straight face. She'll know it's a joke if you laugh.

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