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crack a smile

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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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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

How to use crack a smile in a sentence

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