1. slang A sauce used in Creole, Haitian, and New Orleans cuisine made by sautéing tomatoes, celery, bell peppers, onions, and garlic with a particular mixture or herbs and spices. More formally known as "Creole sauce." Primarily heard in US. My grandmother used to make an amazing red gravy. It would fill the entire house with the most incredible smell as the peppers and onions cooked with the tomatoes.

2. slang An Italian or Italian-American tomato sauce, especially marinara sauce. Primarily heard in US. My mother could be somewhat orthodox about her pasta, so she looked at me aghast when I said I was serving ravioli with a truffle-cream sauce instead of red gravy.