Collapse

an abrupt failure of function or complete physical exhaustion

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

the act of throwing yourself down

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

break down, literally or metaphorically

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

fold or close up

fall apart

cause to burst

suffer a nervous breakdown

lose significance, effectiveness, or value