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English definition of “cave in”

cave in

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 agree to something that you were against before, after someone has persuaded you or threatened you: 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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