gripe vs let go

gripe

verb
  • To annoy or bother. 

  • To suffer griping pains. 

  • To tend to come up into the wind, as a ship which, when sailing close-hauled, requires constant labour at the helm. 

  • To complain; to whine. 

noun
  • A wire rope, often used on davits and other life raft launching systems. 

  • A complaint, often a petty or trivial one. 

  • The compass or sharpness of a ship's stern under the water, having a tendency to make her keep a good wind. 

  • The piece of timber that terminates the keel at the fore end; the forefoot. 

  • Pinching and spasmodic pain in the intestines. 

  • An assemblage of ropes, dead-eyes, and hocks, fastened to ringbolts in the deck, to secure the boats when hoisted. 

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