Definitions for crack-up
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Princeton's WordNet
breakdown, crack-up(verb)
a mental or physical breakdown
crack up, crack, crock up, break up, collapse(verb)
suffer a nervous breakdown
crack up(verb)
rhapsodize about
break up, crack up(verb)
laugh unrestrainedly
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"crack-up." Definitions.net. STANDS4 LLC, 2013. Web. 18 Jun 2013. <http://www.definitions.net/definition/crack-up>.

