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English definition of “what's the use of...?”

what's the use of...?

(also what use is...?)
used to tell someone to stop worrying because worrying will not help: Try not to get depressed - after all, what's the use of worrying?Useless and futile
(Definition of what's the use of...? from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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