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 ?
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.
However, the new Cap'n was a different kettle of fish altogether.