Main Entry: crack up

Function: verb

Date: 1829

transitive verb

1 : praise, tout 4 <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>intransitive verb 1 : to damage or destroy a vehicle (as by losing control) <cracked up on a curve>
2 : to laugh out loud