gravy vs plus sign

gravy

noun
  • Extra benefit. 

  • Unearned gain. 

  • Sauce used for pasta. 

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

  • Curry sauce. 

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

verb
  • To make gravy. 

plus sign

noun
  • The symbol + used to denote the operation of addition, to indicate that a number is positive, and so on. 

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