(idiomatic) A situation recognized as different from or as an alternative to some other situation.
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That is another kettle of fish entirely.
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Network Rail would have faced a bigger issue. Maintaining the track for one freight train a day is one thing - doing so for 200 passenger trains a day was a very different kettle of fish.
dcterms:bibliographicCitation
2023 November 29, Richard Foster, “Tyne & Wear Metro goes with the flow”, in RAIL, number 997, page 34: