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English definition of “go in one ear and out the other”

go in one ear and out the other

informal
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.
(Definition of go in one ear and out the other from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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