The term "mutton gravy cut" seems to be unclear or may not be a standard culinary term. In the context of mutton or any meat, "cut" usually refers to the way the meat is sliced or chopped. For example, "medium cut" refers to medium-sized pieces, "small cut" would be smaller pieces, and "large cut" would be bigger pieces.
However, when it comes to mutton gravy, it generally refers to a type of preparation where the mutton is cooked in a flavorful, spiced sauce or gravy. The mutton is often cut into smaller, bite-sized pieces, which allows it to absorb the flavors of the gravy and become tender during the cooking process.