Definition of crack up in English:

crack up

1 informal Suffer an emotional breakdown under pressure: I feel I’m cracking up, always on the verge of tears
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.
Synonyms
break down, have a breakdown, lose control, be overcome, collapse, go to pieces, go out of one's mind, go mad, crumble, disintegrate
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.
Synonyms
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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Word of the day guzzle
Pronunciation: ˈgʌz(ə)l
verb
eat or drink (something) greedily