Synonyms of crack up in English:

crack up

See US English definition of crack up

See UK English definition of crack up


1‘I feel I'm cracking up, always on the verge of tears’

break down, have a breakdown, lose control, be overcome, collapse, go to pieces, go out of one's mind, go mad, crumble, disintegrate
lose it, lose one's cool, come apart at the seams, fall apart at the seams, go crazy, freak out

2‘she tried to keep a straight face but kept cracking up’

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
be in stitches, break up, crease up, be creased up, be rolling in the aisles
British fall about, laugh like a drain