a different kettle of fish

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

a different kettle of fish

or

another kettle of fish

BRITISH
COMMON You say that something is a different kettle of fish or another kettle of fish to emphasize that it is completely unlike another thing that you are mentioning. Artistic integrity? Who needs it? Money? Now that's a completely different kettle of fish. Howard was a sweetheart. But Clarisse was another kettle of fish.
See also: different, fish, kettle, of

a different kettle of fish

a completely different matter or type of person from the one previously mentioned. informal
1993 Empire Meryl is the finest actress of her generation but Arnold is, er, a different kettle of fish.
See also: different, fish, kettle, of

a different kettle of ˈfish

(informal) a person or thing that is completely different from somebody/something else previously mentioned: You may be able to read French well, but speaking it fluently is a different kettle of fish entirely.
A kettle in this idiom is a pan in which you can cook a whole fish.
See also: different, fish, kettle, of
References in periodicals archive ?
David said: "Each mill has its own particular identity but Wern Mill is a different kettle of fish completely.
PAULO DI CANIO has been sacked - and that makes Liverpool's trip to Sunderland on Sunday a different kettle of fish.
It is a different kettle of fish playing them in their own back yard where they have their unbeaten run, whereas Bordeaux was a slightly more neutral venue.
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.
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.
Faulkner, though, is a different kettle of fish, although the sport will have to learn to trust a bookie - even an ex-one.
It was a great start for us, but we know London Irish will be a different kettle of fish," added Davies.
Chelsea are a different kettle of fish compared to Stoke, and people might say that if we lost to Stoke then we haven't got much hope tomorrow," he said.
It was a different kettle of fish second time up as Pontypridd hit their scoring straps to run out 32-17 winners with two tries apiece for James Davies (Beddau) and Shane Hutchinson (Ynysybwl), with other touchdowns coming from SamGrant (Pontyclun) and Jonathan Barnet (Pontypridd) with Dion Holland (Pontypridd) landing one conversion.
But heat and humidity are a different kettle of fish because they are things you can prepare for.
But Shepley might find Bay a different kettle of fish.
But the singles proved a different kettle of fish with only Andrew McArthur emerging triumphant.
It's a different kettle of fish when it comes to the homeless.
Fresh run salmon, however, are a different kettle of fish altogether.
But midfielder Lampard - who has never won at Anfield - warned: "It'll be a different kettle of fish for us away from home.
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