fight off vs nix

fight off

verb
  • To succeed in defeating a challenge, or an attack. 

  • To resist, particularly an infection or an emotion. 

nix

verb
  • To destroy or eradicate. 

  • To make something become nothing; to reject or cancel. 

intj
  • No! Not at all! 

noun
  • Nothing. 

  • A treacherous water-spirit; a nixie. 

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