backset vs miscarriage

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. 

miscarriage

noun
  • A failure; a mistake or error. 

  • The spontaneous natural termination of a pregnancy, especially before it is viable; the fatal expulsion of a foetus from the womb before term. 

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