prove out vs see how wind blows

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. 

see how wind blows

How often have the words prove out and see how wind blows occurred in a corpus of books? (source: Google Ngram Viewer )