optate vs settle on

optate

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 optate and settle on occurred in a corpus of books? (source: Google Ngram Viewer )