cave in

1. The sudden collapse of something into a hollow beneath it (synset 107376016)
   is a type of: collapse - a natural event caused by something suddenly falling down or caving in
   same as: subsidence

1. Break down, literally or metaphorically (synset 201993067)
   "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"
   is a type of: change - undergo a change; become different in essence; losing one's or its original nature
   subtypes:

   • go off, implode - burst inward
   • buckle, crumple - fold or collapse
   • flop - fall loosely
   • break - curl over and fall apart in surf or foam, of waves
   • sink, slide down, slump - fall or sink heavily
   same as: break, collapse, fall in, founder, give, give way
   verb group:

   • abandon, give up - stop maintaining or insisting on; of ideas or claims
   • burst, collapse - cause to burst

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