highway robbery vs overmuch

highway robbery

noun
  • Said of excessive or exorbitant prices. 

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

overmuch

noun
  • An excessive amount; too much. 

adj
  • Excessive. 

adv
  • Too much; overly much 

det
  • Very much; too much 

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