vt. 使倒塌；使瓦解

n an abrupt failure of function or complete physical exhaustion

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

n the act of throwing yourself down

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

v break down, literally or metaphorically

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

v fold or close up

v fall apart

v cause to burst

v suffer a nervous breakdown

v lose significance, effectiveness, or value