Crack-up Definition

crackup
verb

(idiomatic, intransitive) To laugh heartily.

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

(idiomatic) To cause to laugh heartily.

The joke about the nuns in the bath cracked me up.
Wiktionary
(intransitive, idiomatic) To become insane; to suffer a mental breakdown.
She got through the war, but cracked up when her sister died.
Wiktionary
Synonyms:
Antonyms:
  • be calm

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crack-up