collapse

[1]	fall (down/in/apart) , crumple , cave in , deflate , crumble , tumble down , break down , go
[2]	fail , (come to an) end , fall through , peter out , disintegrate , dissolve , fall flat , founder , come to naught/nought , break up/down , decline , diminish , disappear , evaporate , go up in smoke , go bankrupt , go under , (Brit) go to the wall , (Colloq) fizzle out
[3]	pass out , faint , drop , (Colloq) keel over , (Old-fashioned/Literary) swoon
[4]	break down (mentally) , have a (nervous) breakdown , go to pieces , come/fall apart , (Colloq) crack up , (US) crack
[5]	fall in , cave in , give , give way , break , founder
[6]	break down
[7]	crumble , crumple , tumble , break down
[8]	burst
[9]	crack up , crack , crock up , break up

[1]	prostration
[2]	flop
[3]	crash
[4]	cave-in , breakdown
[5]	failure , downfall , ruin , disappearance , disintegration , dissolution , bankruptcy
[6]	(mental) breakdown , prostration , (Colloq) crack-up