come off vs prove out

come off

verb
  • To appear; to seem; to project a certain quality. 

  • To occur; to take place. 

  • To have some success; to succeed. 

  • To become detached. 

  • To escape or get off (lightly, etc.); to come out of a situation without significant harm. 

prove out

verb
  • To turn out to be feasible, accurate, true, satisfactory, as expected, hoped, stated, etc. 

  • To demonstrate the feasibility of; to show or be shown to be feasible, accurate, true, satisfactory, as expected, hoped, stated, etc. 

How often have the words come off and prove out occurred in a corpus of books? (source: Google Ngram Viewer )