Wiktionary
fish to fry
n. (context idiomatic English) A matter to attend to.
Usage examples of "fish to fry".
Though Sloat promised himself that as soon as he had taken care of Lily Cavanaugh and her boy he was going to begin dropping clients from his list - he had much bigger fish to fry now.
Mr Giuseppe, abe thought, would have better fish to fry elsewhere.
Mum was always wanting her to learn to do practical things with it like washing dishes and churning butter, but even Mum never turned down a nice mess of fish to fry.