cave in vs oppose

cave in

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

  • To collapse inward or downward. 

noun
  • The act of relenting. 

  • The location where something has caved in. 

  • The act of something collapsing or caving in. 

oppose

verb
  • To attempt to stop the progression of; to resist or antagonize by physical means, or by arguments, etc.; to contend against. 

  • To object to. 

  • To place in front of, or over against; to set opposite; to exhibit. 

  • To present or set up in opposition; to pose. 

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