backset vs turndown

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. 

turndown

noun
  • A rejection. 

  • The operational range of a device 

  • A downturn. 

  • A downward pointing extension to a vehicle muffler. 

  • The service of turning down the bedcovers and often leaving chocolates, etc., on the pillow. 

adj
  • Made to wear with the upper part turned down. 

  • Capable of being turned down, or decreased in intensity. 

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