The phrase "having fish to fry" typically means being occupied or having more important things to do. However, if we look for antonyms for this phrase, we can find numerous different expressions. Firstly, "having free time," "being idle" and "having no plans" all suggest a complete lack of engagement, activity or excitement. Additionally, "having nothing to worry about," "having an easy day," and "having no commitments" all imply a breezy, relaxed lifestyle with no particular responsibilities or chores to attend to. Ultimately, there are numerous antonyms to "having fish to fry," and the choice between them depends on the speaker's unique circumstances and priorities.