highway robbery vs upscale

highway robbery

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

  • Said of excessive or exorbitant prices. 

upscale

verb
  • To increase in size, to scale up. 

adj
  • Marked by wealth or quality; high-class; upmarket. 

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