Meaning of COLLAPSE in English
( v. i. )
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.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012