Collapse

Part of speech: noun (n.)

1. A falling together suddenly, as of the sides of a hollow vessel.

2. A sudden and complete failure; an utter failure of any kind; a breakdown. [Colloq.]

3. Extreme depression or sudden failing o

Part of speech: verb (v.)

1. To fall together suddenly, as the sides of a hollow vessel; to close by falling or shrinking together; to have the sides or parts of (a thing) fall in together, or be crushed in together; as, a flue in the boiler of a steam engine sometimes collapses. A balloon collapses when the gas escapes from it. Maunder.

2. To fail suddenly and completely, like something hollow when subject to too much pressure; to undergo a collapse; as, Maximilian's government collapsed soon after the French army left Mexico; many financial projects collapse after attaining some success and importance.