Idiom: keep a straight face
— When the speaker kept criticizing my professor it was hard for us to keep a straight face.
— I had to keep a straight face while my six year-old sister told me about breaking up with her "boyfriend" but I laughed about it with our mom afterwards.
— It's hard to keep a straight face when you're yelling like a crazy person.
— I kept a straight face but I was furious when my mother-in-law told everyone my son doesn't like my cooking.
— Everybody was able to keep a straight face during our class on reproductive health except Jennifer who giggled throughout.
— My family tried to keep a straight face when my little sister came out wearing my mom's lingerie.
— We tried but no one could keep a straight face when the Prime Minister farted loudly.
— How can you keep a straight face when customers lie so blatantly?
— No one could keep a straight face when our boss took credit for our idea for the fundraiser.
— I was keeping a straight face while my boss was yelling at us until my coworker kicked me and I burst out laughing.
— Whatever you do, keep a straight face during the presentation.
— I tried to keep a straight face while my roommate lied about eating my leftover pizza.
— Somehow my father kept a straight face when my boyfriend confessed he'd just gotten out of rehab for heroin addiction.
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