be another kettle of fish

another kettle of fish

Any issue or matter that is entirely different in scope, description, or nature from that which was just being discussed. A: "So you like your first two roommates, but what about your third one?" B: "William? Oh, he's another kettle of fish altogether." I suppose we should start looking at buying a house now that our baby is on the way, but that's another kettle of fish!
See also: another, fish, kettle, of

be another kettle of fish

To be entirely different in scope or description from someone or something that was just being discussed. A: "So you like your first two roommates, but what about your third one?" B: "William? Oh, he's another kettle of fish altogether." I suppose we should start looking at buying a house now that our baby is on the way, but that's another kettle of fish!
See also: another, fish, kettle, of
Farlex Dictionary of Idioms.
See also:
  • another kettle of fish
  • be a different kettle of fish
  • kettle
  • a different kettle of fish
  • be a whole other kettle of fish
  • another pair of shoes
  • another story
  • answer to the description (of)
  • answer to the description of
  • scope someone out