beat to a pulp vs rough up

beat to a pulp

verb
  • To beat up (a person) more than usually severely. 

  • To defeat severely in various, even non-contact, competitive sports. 

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 beat to a pulp and rough up occurred in a corpus of books? (source: Google Ngram Viewer )