debark vs flatten out

debark

verb
  • To devocalize (a dog). 

  • To disembark. 

  • To unload goods from an aircraft or ship. 

  • To remove the bark from a tree, especially one that has been felled. 

flatten out

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

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

  • To become more even. 

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