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English definition of “long-lost”

long-lost

adjective [before noun] uk   /ˈlɒŋ.lɒst/ us    /ˈlɑːŋ.lɑːst/
describes a relation, friend, or object that you have not seen for a long time: my long-lost cousinFamily relations in general
(Definition of long-lost from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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