adopt vs settle on

adopt

verb
  • To select and take or approve. 

  • To take voluntarily (a child of other parents) to be in the place of, or as, one's own child. 

  • To take or receive as one's own what is not so naturally. 

  • To obtain (a pet) from a shelter or the wild. 

  • To take by choice into the scope of one's responsibility. 

  • To beat an opponent ten times in a row. 

settle on

verb
  • To make a decision or selection; to decide, arrange, or agree on. 

  • Used other than figuratively or idiomatically: see settle, on. 

  • To confer (an annuity, etc) upon by permanent grant; to assure to. (Compare settle (“formally, legally secure”).) 

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