Noun

• S: (n) collapse, prostration (an abrupt failure of function or complete physical exhaustion) "the commander's prostration demoralized his men"
• S: (n) collapse (a natural event caused by something suddenly falling down or caving in) "the roof is in danger of collapse"; "the collapse of the old star under its own gravity"
• S: (n) flop, collapse (the act of throwing yourself down) "he landed on the bed with a great flop"
• S: (n) crash, collapse (a sudden large decline of business or the prices of stocks (especially one that causes additional failures))

Verb

• S: (v) collapse, fall in, cave in, give, give way, break, founder (break down, literally or metaphorically) "The wall collapsed"; "The business collapsed"; "The dam broke"; "The roof collapsed"; "The wall gave in"; "The roof finally gave under the weight of the ice"
• S: (v) break down, collapse (collapse due to fatigue, an illness, or a sudden attack)
• S: (v) collapse (fold or close up) "fold up your umbrella"; "collapse the music stand"
• S: (v) crumble, crumple, tumble, break down, collapse (fall apart) "the building crumbled after the explosion"; "Negotiations broke down"
• S: (v) collapse, burst (cause to burst) "The ice broke the pipe"
• S: (v) crack up, crack, crock up, break up, collapse (suffer a nervous breakdown)
• S: (v) collapse (lose significance, effectiveness, or value) "The school system is collapsing"; "The stock market collapsed"