ill-treat vs rough up

ill-treat

verb
  • To treat someone or something badly or unkindly; to abuse or mistreat. 

rough up

verb
  • to manhandle or beat up 

  • To make rough, to roughen (especially doing so to wood while raising the grain) 

How often have the words ill-treat and rough up occurred in a corpus of books? (source: Google Ngram Viewer )