keep a straight face
Don't show one's feelings, especially refrain from laughing. For example, The school orchestra played so many wrong notes that I had trouble keeping a straight face. [Late 1800s]
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- keep a civil tongue in one's head,
- keep a low profile,
- keep a sharp lookout,
- keep a stiff upper lip,
- keep a weather eye out,
- keep abreast of,
- keep after,
- keep an eye on,
- keep an eye out for
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.