gold rush vs gravy

gold rush

noun
  • A cocktail made from bourbon, honey, and lemon juice. 

  • Any period of feverish migration into an area in which gold has been discovered. 

  • A feverish obsession with seeking profits, especially in new markets. 

  • The urge to win gold medals, as in the Olympic Games. 

gravy

noun
  • A dark savoury sauce prepared from stock and usually meat juices; brown gravy. 

  • Unearned gain. 

  • Sauce used for pasta. 

  • Extra benefit. 

  • Curry sauce. 

  • A pale sauce prepared from a roux with meat fat; a type of béchamel sauce. 

verb
  • To make gravy. 

How often have the words gold rush and gravy occurred in a corpus of books? (source: Google Ngram Viewer )