gravy vs nonnegative

gravy

noun
  • Unearned gain. 

  • Sauce used for pasta. 

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

  • Extra benefit. 

  • Curry sauce. 

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

verb
  • To make gravy. 

nonnegative

noun
  • Any value that is not negative. 

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