A “deep fry” is distinguished by totally submerging the food in oil, as opposed to a shallow fry (less often said, but still used) where something is fried in hot oil, but not enough to totally cover it. I thiiiiink Mandarin makes a similar distinction with the use of “broad oil” versus “bottom oil”, but I don’t speak Mandarin and I’m taking that from the rough translations from Chinese cooking videos I watch.