highway robbery vs plush

highway robbery

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

  • Said of excessive or exorbitant prices. 

plush

adj
  • Having a soft, fluffy exterior. 

  • Very extravagant. 

  • Very expensive, or appearing expensive; opulent, luxurious. 

noun
  • A textile fabric with a nap or shag on one side, longer and softer than the nap of velvet. 

  • A plush toy. 

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