cheap vs highway robbery

cheap

noun
  • Price. 

  • Cheapness; lowness of price; abundance of supply. 

adv
  • Cheaply. 

adj
  • Trading at a price level which is low relative to historical trends, a similar asset, or (for derivatives) a theoretical value. 

  • Of poor quality. 

  • Low and/or reduced in price. 

  • Stingy; mean; excessively frugal. 

  • Underhand or unfair. 

  • Of little worth. 

highway robbery

noun
  • The act of robbing a traveler on a public road. 

  • Said of excessive or exorbitant prices. 

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