hold on vs unfix

hold on

verb
  • To remain loyal. 

  • To grasp or grip firmly. 

  • To persist. 

  • To keep; to store something for someone. 

  • Wait a short while. 

unfix

verb
  • To unfasten from a fixing. 

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