backset vs slowdown

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. 

slowdown

noun
  • A reduction in speed, or a decrease in the level of production, etc. 

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