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

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.
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.
Faulkner, though, is a different kettle of fish, although the sport will have to learn to trust a bookie - even an ex-one.
But not knowing whether or not I am going to stay at the club is a different kettle of fish.
The Tote Cesarewitch is a different kettle of fish but punters can get stuck into this sort of race.
In an email to colleagues, Rhian Roberts, head of development at Radio 5 live, wrote: "I've been looking at security following a l f i id t d th lit th tM di couple of incidents - and the reality that MediaCity is a different kettle of fish to W12.