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be another matter/thing

Definition

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.Being and appearing different 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).Being and appearing differentComplicated and difficult to doDifficult to understand
(Definition of be another matter/thing from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)