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 ?
Tuohy said: "Wales will be a different kettle of fish, they've had a bit of a 'feeler' game against Italy.
Now if he should offer Guisborough and Nunthorpe instead, well that would be a different kettle of fish, at least we could get on with building the East Middlesbrough Relief Road.
It will be a different kettle of fish and there will be different expectations.
But next Sunday I think is going to be a different kettle of fish.
When confronted with burglars on your property in the middle of the night it might be a different kettle of fish for people who tell researchers they would do a Tony Martin.