cave in vs drenching

cave in

noun
  • The act of something collapsing or caving in. 

  • The act of relenting. 

  • The location where something has caved in. 

verb
  • To collapse inward or downward. 

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

drenching

noun
  • The act by which something is drenched; a soaking. 

  • The administering of a medicinal draught to an animal. 

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