cave in vs climb

cave in

verb
  • To collapse inward or downward. 

  • To relent; to grant approval against one's initial will. 

noun
  • The act of relenting. 

  • The location where something has caved in. 

  • The act of something collapsing or caving in. 

climb

verb
  • To mount; to move upwards on. 

  • To move to a higher position on the social ladder. 

  • to jump high 

  • Of plants, to grow upwards by clinging to something. 

  • To move (especially up and down something) by gripping with the hands and using the feet. 

  • to practise the sport of climbing 

  • To scale; to get to the top of something. 

  • To ascend; rise; to go up. 

noun
  • The act of getting to somewhere more elevated. 

  • An upwards struggle 

  • An act of climbing. 

How often have the words cave in and climb occurred in a corpus of books? (source: Google Ngram Viewer )