Definition of crack up in English:

crack up

informal
  • 1Suffer an emotional breakdown under pressure.
    More example sentences
    • I was short-tempered and I was cracking up a bit under the pressure of it all.
    • ‘If I had not had Diana and the children I would have cracked up and had a mental breakdown by now,’ he said.
    • His stylish arthouse flick looks at three women as they crack up.
  • 2 (also crack someone up) Burst or cause to burst into laughter.
    More example sentences
    • He cracks up into laughter, his shoulders heaving uncontrollably.
    • I really cracked up in laughter when I read the headline ‘Protest is the backbone of democracy’.
    • Before I knew it I was buzzed and cracking up with laughter.
See parent entry: crack

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody