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English definition of “countersign”

countersign

verb [T] uk   /ˈkaʊn.tə.saɪn/ us    /-t̬ɚ-/ specialized
to write your name on a document that already has the signature (= name written) of another person, especially in order to show that you are certain that the first person is who they say they areSigning and signatures
(Definition of countersign from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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