Definition of "Collapse" :

noun: the act of throwing yourself down

noun: a natural event caused by something suddenly falling down or caving in

"The roof is in danger of collapse."

noun: a sudden large decline of business or the prices of stocks (especially one that causes additional failures)

noun: an abrupt failure of function or complete physical exhaustion

verb: collapse due to fatigue, an illness, or a sudden attack

verb: lose significance, effectiveness, or value

"The stock market collapsed."

verb: suffer a nervous breakdown

verb: break down, literally or metaphorically

"The wall collapsed."

verb: cause to burst

verb: fall apart

verb: fold or close up

"Collapse the music stand."