Definition of crack-up
(Entry 1 of 2)
2a : a mental collapse : nervous breakdown his wife's death brought on his crack-up
crack up
verbcracked up; cracking up; cracks up
Definition of crack up (Entry 2 of 2)
1 : praise, tout sense 1 wasn't all that it was cracked up to be
2 : to damage or destroy (a vehicle) by crashing
crack up a car
3 : to cause to laugh out loud
that joke really cracks him up
1 : to damage or destroy a vehicle (as by losing control)
cracked up on a curve
2 : to laugh out loud
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Time Traveler for crack-up
The first known use of crack-up was in 1829
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