postmarknoun [ C ]uk /ˈpəʊst.mɑːk/ us /ˈpoʊst.mɑːrk/
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verb [ T ] uk us
(Definition of “postmark” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
(Definition of “postmark” from the Cambridge Academic Content Dictionary © Cambridge University Press)
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to make a surface shiny by putting a liquid substance onto it and leaving it or heating it until it dries