be a different kettle of fish

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be a different kettle of fish

To be entirely different in scope or description from someone or something that was just being discussed. Steve: "So you like your first two roommates, but what about your third one?" Joe: "William? Oh, he's a different kettle of fish altogether. I suppose we could start looking at buying a house now that our baby is on the way, but that's an entirely different kettle of fish!
See also: different, fish, kettle, of
References in periodicals archive ?
Defeat to Arsenal in the FA Cup last month was mighty disappointing but Everton are a different kettle of fish at home.
Defeat to Arsenal in the FA Cup last month was mighty disappointing, but Everton are a different kettle of fish at home.
They may do that on services operated by Go North East, but Arriva are a different kettle of fish.
But Sandbach are a different kettle of fish, and the visitors will have to be fully switched on for this one if they are to give themselves a chance of moving up to first or second spot in the table.
Wigan are a different kettle of fish playing at home with so much to play for.
However, today's asylum seekers are a different kettle of fish.