Crack-up definition

Frequency:
(idiomatic, intransitive) To laugh heartily.

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

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(idiomatic) To cause to laugh heartily.

The joke about the nuns in the bath cracked me up.

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(intransitive, idiomatic) To become insane; to suffer a mental breakdown.

She got through the war, but cracked up when her sister died.

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