let go vs show someone the door

let go

verb
  • To ignore (a comment, etc.). 

  • 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 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 

show someone the door

verb
  • To dismiss, fire, or reject; to exclude someone who was formerly included. 

  • To escort someone to the exit of the premises; to expel someone from a room, gathering, etc. 

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