backset vs countercheck

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. 

countercheck

noun
  • A second check (in order to confirm or deny a previous one). 

  • A restriction or limit. 

verb
  • To restrict or limit by counteracting. 

  • To recheck. 

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