backset vs blackball

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. 

blackball

noun
  • A rejection; a vote against admitting someone. 

  • A black ball used to indicate such a negative vote. 

  • A kind of large black sweet; a niggerball. 

  • A game, a standardized version of the English version of eight-ball. 

  • A substance for blacking shoes, boots, etc. or for taking impressions of engraved work. 

verb
  • To ostracize. 

  • To vote against, especially in an exclusive organization. 

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