kettle of fish

[kettle of fish] {v. phr.}, {informal} Something to be considered;how things are; a happening; business.

I thought he needed money,but it was another kettle of fish - his car had disappeared.

-Usually used with "pretty", "fine", "nice", but meaning bad trouble.

He had two flat tires and no spare on a country road at night, whichwas certainly a pretty kettle of fish.

This is a fine kettle offish! I forgot my book.

Compare: CUP OP TEA(2).