Definitions by Collins English Electronic Dictionary Digital Edition: 2008 © HarperCollins Publishers 2008

1. cave in

   1. verb, to collapse; subside
   2. verb, to yield completely, esp under pressure
   3. noun, the sudden collapse of a roof, piece of ground, etc, into a hollow beneath it; subsidence
   4. noun, the site of such a collapse, as at a mine or tunnel
   5. noun, an instance of yielding completely, esp under pressure
   6. Show me some examples of this word: cave in

By Defined by Harper Collins