hold on vs let go

hold on

verb
  • To grasp or grip firmly. 

  • To remain loyal. 

  • To persist. 

  • To keep; to store something for someone. 

  • Wait a short while. 

let go

verb
  • To release from one's grasp; to go from a state of holding on to a state of no longer holding on. 

  • To dismiss from employment. 

  • To ignore (a comment, etc.). 

  • To emotionally disengage or to distract oneself from a situation. 

  • To fail to maintain a standard of appearance, behavior, or performance. 

  • Used other than figuratively or idiomatically: see let, go. 

  • To gain weight 

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