backset vs whirl

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. 

whirl

noun
  • (usually following “give”) A brief experiment or trial. 

  • Something that whirls. 

  • A rapid series of events. 

  • Dizziness or giddiness. 

  • An act of whirling. 

  • A confused tumult. 

verb
  • To make something or someone whirl. 

  • To have a sensation of spinning or reeling. 

  • To remove or carry quickly with, or as with, a revolving motion; to snatch. 

  • To rotate, revolve, spin or turn rapidly. 

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