crack up
Dictionary
verb
- To laugh heartily.
"It was hilarious. We were cracking up the whole time."
- To cause to laugh heartily.
"The joke about the nuns in the bath cracked me up."
- To become insane; to suffer a mental breakdown.
"She got through the war, but cracked up when her sister died."
- (usually passive, usually negative) To cry up; to extol.
"This new computer system is not what it was cracked up to be."
- (of an aircraft or automobile) To crash.
adjective
- Funny; hilarious
"That joke was crack up."
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