Definition of crack up in English:

crack up

  • 2 informal Burst into laughter: she tries to keep a straight face, but she keeps cracking up
    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.
    burst out laughing, dissolve into laughter, roar with laughter, shake with laughter, laugh uncontrollably, guffaw, be doubled up, split one's sides, hold one's sides
    informal fall about, be in stitches, break up, crease up, be creased up, be rolling in the aisles, laugh like a drain
See parent entry: crack

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