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be a whole other kettle of fish

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be a whole other 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 whole other kettle of fish." I suppose we could start looking at buying a house now that our baby is on the way, but that's a whole other kettle of fish!

See also: fish, kettle, of, other, whole