better fish to fry
More important matters to deal with. I can't worry about that now, I've got better fish to fry! I want Chris to help me with this project, but he claims he has better fish to fry right now.
better fish to fry
More important things to do. This way of saying that you don't want to waste your time with something (or someone) goes back to 17th-century England. Its French equivalent is “other dogs to whip.” Variations are “other fish to fry” and “better fish to fry.”