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English definition of “be past your sell-by date”

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be past your sell-by date

If someone is past their sell-by date, that person is not wanted or useful any more because they are too old: There's plenty of time to have a baby. I'm not past my sell-by date yet.
(Definition of be past your sell-by date from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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