definitions

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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Nearby words

keep, keep a civil tongue in one's head, keep a low profile, keep a sharp lookout, keep a stiff upper lip, keep a straight face, 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.