a straight face

Related to a straight face: keep a straight face

a straight face

An emotionless facial expression, especially in a humorous situation that could easily cause one to laugh. It's so hard to keep a straight face on camera when you have hilarious co-stars like I do.
See also: face, straight
Farlex Dictionary of Idioms.

*straight face

Fig. a face free from smiles or laughter. (*Typically: have ~; keep ~.) It's hard to keep a straight face when someone tells a funny joke.
See also: face, straight
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

(keep) a straight ˈface

manage not to laugh: When she told me about her accident with the pig, I couldn’t keep a straight face.
See also: face, straight
Farlex Partner Idioms Dictionary
See also:
  • straight face
  • keep a straight face
  • keep a straight face, to
  • poker face
  • poker face, a
  • deadpan
  • MFW
  • ricockulous
  • me three
  • my face when