crack a smile
Smile, as in Betty was a very serious person; she rarely cracked a smile. This colloquialism transfers crack in the sense of “break” to breaking a serious facial expression into a smile.
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Question 1 of 9
You may have read the word "simmer" in a recipe or two, but what does it really mean?
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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.