come down vs flatten out

come down

verb
  • To reach a decision. 

  • Shortening of of come down the (pike, line, etc.) To be about to happen. 

  • To return from an elevated state of consciousness or emotion. 

  • To rain. 

  • To decrease. 

  • To graduate from university, especially an Oxbridge university. 

  • To be demolished. 

  • To be passed through time. 

  • To descend, fall down, collapse. 

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). 

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