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English definition of “cave in”

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cave in

verb [I], verb uk phrasal verb with cave   // /keɪv/ us  

(FALL)

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.

(AGREE)

informal to cave verb : At first, they refused to sign the agreement, but they caved in when they heard another firm was being approached.
(Definition of cave in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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