gravy vs plus mark

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 mark

noun
  • A plus sign. 

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