cave in vs fight

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. 

fight

noun
  • A physical confrontation or combat between two or more people or groups. 

  • An occasion of fighting. 

  • A conflict, possibly nonphysical, with opposing ideas or forces; strife. 

  • The will or ability to fight. 

  • A boxing or martial arts match. 

verb
  • To conduct or engage in (battle, warfare etc.). 

  • To engage in combat with; to oppose physically, to contest with. 

  • Of colours or other design elements: to clash; to fail to harmonize. 

  • To try to overpower; to fiercely counteract. 

  • To contend in physical conflict, either singly or in war, battle etc. 

  • To contend in physical conflict with each other, either singly or in war, battle etc. 

  • To strive for something; to campaign or contend for success. 

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