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Phrase(s): have bigger fish to fry [and] have other fish to fry; have more important fish to fry
Fig. to have other things to do; to have more important things to do. • I can’t take time for your problem. I have other fish to fry. • I won’t waste time on your question. I have bigger fish to fry.
McGrawhill's American Idioms And Phrasal Verbs