crack up Rate this phrase:(3.00 / 1 vote)
To become insane; to suffer a mental breakdown.

She got through the war, but cracked up when her sister died.

Additional definitions for 'crack up':

crack upTo laugh heartily.
crack upTo cause to laugh heartily.
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"crack up." Phrases.net. STANDS4 LLC, 2018. Web. 17 Aug. 2018. <https://www.phrases.net/phrase/crack-up_447>.

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