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, which was certainly a pretty kettle of fish.

This is a fine kettle of fish! I forgot my book.

Compare: CUP OF TEA (2).