cling vs let go

cling

verb
  • To be fond of, to feel strongly about and dependent on. 

  • To cause to adhere to, especially by twining round or embracing. 

  • To adhere to an object, without being affixed, in such a way as to follow its contours. Used especially of fabrics and films. 

  • To cause to dry up or wither. 

  • To dry up or wither. 

  • To hold very tightly, as to not fall off. 

  • To produce a high-pitched ringing sound, like a small bell. 

noun
  • Fruit (especially peach) whose flesh adheres strongly to the pit. 

  • adherence; attachment; devotion 

  • An ornament that clings to a window so as to be seen from outside. 

let go

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

  • To dismiss from employment. 

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

  • To ignore (a comment, etc.). 

  • 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 cling and let go occurred in a corpus of books? (source: Google Ngram Viewer )