Definition of crack up in English:

crack up

phrasal verb

informal
  • 1Suffer an emotional breakdown under pressure.

    ‘I feel I'm cracking up, always on the verge of tears’
    • ‘‘If I had not had Diana and the children I would have cracked up and had a mental breakdown by now,’ he said.’
    • ‘He left the club having exhibited signs that he was cracking up under the strain months before.’
    • ‘The guys had cracked up so hard, but I was just very traumatized.’
    • ‘Many of us are visibly cracking up after serving two years.’
    • ‘His stylish arthouse flick looks at three women as they crack up.’
    • ‘I was short-tempered and I was cracking up a bit under the pressure of it all.’
    break down, have a breakdown, lose control, be overcome, collapse, go to pieces, go out of one's mind, go mad, crumble, disintegrate
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  • 2Burst into laughter.

    ‘she tries to keep a straight face, but she keeps cracking up’
    • ‘All it takes is for one person to crack up and we all collapse.’
    • ‘Luckily, it's hard to get too stressed when you're trying to stop yourself cracking up with laughter.’
    • ‘He blushed furiously, and Alex cracked up with laughter.’
    • ‘Jules mouth was hanging open while Brad looked like he would burst out cracking up any moment.’
    • ‘Beth cracks up and falls back down onto the towel.’
    • ‘We were laughing so hard that we just fell over cracking up, unable to control ourselves any longer.’
    • ‘Lila said and the girls started cracking up with laughter.’
    • ‘This time I can't hold back my laughter and I crack up.’
    • ‘Stuart standing there is too much for the security guard and he cracks up laughing.’
    • ‘He shut the door in his face and led Mystie back to his room where they cracked up and collapsed on his bed.’
    • ‘Ancestral forms of play and laughter existed in other animals long before humans began cracking up.’
    • ‘Kayla heard them cracking up into laughter from her spot in the kitchen.’
    • ‘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’.’
    • ‘He heard the whole class with the exception of her friends crack up laughing.’
    • ‘Then without warning, instead of blowing up, she started cracking up in hysterical laughter.’
    • ‘"Oh Jesus " Alice said wearily and then cracked up laughing.’
    • ‘Melissa narrowed her eyes and glared at the two guys, who were cracking up with laughter.’
    • ‘Before I knew it I was buzzed and cracking up with laughter.’
    • ‘I could tell the elder student wanted to crack up in laughter about then, but prevented himself from doing so with a mere smile.’
    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
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