Definition of 'cave in'

Noun

1. the sudden collapse of something into a hollow beneath it
      Synonyms: subsidence

Verb

1. break down, literally or metaphorically; "The wall collapsed"; "The business collapsed"; "The dam broke"; "The roof collapsed"; "The wall gave in"; "The roof finally gave under the weight of the ice"
      Synonyms: collapse fall in give give way break founder

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