backset vs pervert

backset

verb
  • To plow again in the fall; said of prairie land broken up in the spring. 

noun
  • A check; a relapse; a discouragement; a setback. 

  • Whatever is thrown back in its course, such as water. 

pervert

verb
  • To turn another way; to divert. 

  • To corrupt; to cause to be untrue; corrupted or otherwise impure 

  • to misinterpret designedly. 

  • To misapply, misuse, use for a nefarious purpose 

  • To become perverted; to take the wrong course. 

noun
  • A person whose sexual habits are not considered acceptable. 

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