Definition of “be another matter/thing” - English Dictionary

british dictionary

“be another matter/thing” in British English

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be another matter/thing

to be a different situation that is likely to be judged differently:

Cars are useful, but their impact on the environment is another matter altogether.

to be very different and likely to involve more problems or difficulties:

Wanting to help the homeless is one thing, finding cheap secure accommodation for them is quite another (thing).

(Definition of “be another matter/thing” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)