bilge vs cave in

bilge

verb
  • To break open the bilge(s) of. 

  • To spring a leak in the bilge. 

  • To bulge or swell. 

noun
  • Stupid talk or writing; nonsense. 

  • The lowest inner part of a ship's hull, where water accumulates. 

  • The water accumulated in the bilge; bilge water. 

  • The rounded portion of a ship's hull, forming a transition between the bottom and the sides. 

  • talk bilge 

  • The bulging part of a barrel or cask. 

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. 

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