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English definition of “cave in”

cave in

(FALL) phrasal verb with cave     /keɪv/ verb
If a ceiling , roof , or other structure caves in, it breaks and falls into the space below: Because of the explosion , the roof of the building caved in, trapping several people .Destroying and demolishingDamaging and spoiling
(Definition of cave in (FALL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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