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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
crack-up is a noun meaning "a mental or physical breakdown". It carries one recorded sense.
a mental or physical breakdown
Definitions, synonyms and semantic relations for crack-up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.