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English definition of “old chestnut”

old chestnut

informal
a subject, idea, or joke that has been discussed or repeated so often that it is not funny any more: I wondered whether there might, after all, be some truth in the old chestnut that one's school days are the happiest of one's life.
(Definition of old chestnut from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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Translations of “old chestnut”

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