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go in one ear and out the other

informal

Definition

If you say that something you hear goes in one ear and out the other, you mean you quickly forget it: If I have to listen to something I don't understand, it just goes in one ear and out the other.Forgetting and forgetfulness
(Definition of go in one ear and out the other from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“go in one ear and out the other” in other dictionaries

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