The phrase "fish to fry" is an idiom that means to have more important things to do than what is currently being discussed or considered. Some synonyms for this phrase include having bigger fish to fry, having other fish to fry, having more pressing matters to attend to, and having more important things to worry about. All of these idiomatic expressions convey a sense of urgency or importance for someone to move on to a more significant task or issue. They also suggest that the current topic or activity is not as important or relevant as other matters that require attention or action.