Basic Guidelines For English Spellings
1 informal Burst into laughter.
- ‘she tries to keep a straight face, but she keeps cracking up’
- 1.1crack someone up, crack up someoneCause someone to burst into laughter.
- ‘this photo cracks me up’
2 informal Suffer an emotional breakdown under pressure.
break down, have a breakdown, lose control, be overcome, collapse, go to pieces, go out of one's mind, go mad, crumble, disintegrateView synonyms
- ‘I feel I'm cracking up, always on the verge of tears’
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