highway robbery vs towering

highway robbery

noun
  • Said of excessive or exorbitant prices. 

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

towering

noun
  • The act or condition of being high above others. 

adj
  • Very tall or high, so as to dwarf anything around it. 

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