collapse
B1Substantiv/US /kəlˈæps/ kəl-ĂPS; UK /kəlˈæps/ kəl-ĂPS/
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 fall in together, or be crushed in together; as, a flue in the boiler of a steam engine sometimes collapses.
