1.Definition: 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"

Category: General

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

Related Noun(s):crash

Category: General

3.Definition: an abrupt failure of function or complete physical exhaustion

Related Noun(s):prostration

Category: General

4.Definition: the act of throwing yourself down

Related Noun(s):flop

Category: General