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English definition of “water off a duck's back”

water off a duck's back

C2 criticisms of or warnings to a particular person that have no effect on that person: I've told him that he's heading for trouble, but he doesn't listen - it's just water off a duck's back.Useless and futile
(Definition of water off a duck's back from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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