backset vs mischance

backset

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

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

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

mischance

noun
  • A mishap, an unlucky circumstance. 

  • Bad luck, misfortune. 

verb
  • To undergo (a misfortune); to suffer (something unfortunate). 

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