flatten out vs put in

flatten out

verb
  • To become more even. 

  • To win a fight, usually by punching someone until they are knocked over 

  • To make flat (something rough, folded or bumpy). 

put in

verb
  • To contribute. 

  • To call at (a place or port), especially as a deviation from an intended journey. 

  • To apply, request, or submit. 

  • To place inside. 

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