fight back vs overwin

fight back

verb
  • to repress; to struggle to repress. 

  • to counterattack; to resist an attack. 

  • to defend oneself by fighting. 

  • to overturn a losing deficit. 

overwin

verb
  • To overcome; gain one's point; exceed. 

noun
  • The win or winning of a game. 

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