let go vs qualify

let go

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

  • 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 emotionally disengage or to distract oneself from a situation. 

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

  • To gain weight 

qualify

verb
  • To give individual quality to; to modulate; to vary; to regulate. 

  • To certify or license someone for something. 

  • To throw and catch each object at least twice. 

  • To compete successfully in some stage of a competition and become eligible for the next stage. 

  • To make someone, or to become competent or eligible for some position or task. 

  • To modify, limit, restrict or moderate something; especially to add conditions or requirements for an assertion to be true. 

  • To describe or characterize something by listing its qualities. 

noun
  • An instance of throwing and catching each prop at least twice. 

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