Meaning of “(like) water off a duck's back” in the English Dictionary

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"(like) water off a duck's back" in British English

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(like) 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.

(Definition of “(like) water off a duck's back” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)