crack up Rate this phrase:(4.00 / 3 votes)
To laugh heartily.

It was hilarious. We were cracking up the whole time.

Additional definitions for 'crack up':

crack upTo cause to laugh heartily.
crack upTo become insane; to suffer a mental breakdown.
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"crack up." Phrases.net. STANDS4 LLC, 2018. Web. 17 Jul 2018. <http://www.phrases.net/phrase/crack-up_445>.

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