Definition of 'countersign'

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Noun

1. a secret word or phrase known only to a restricted group; "he forgot the password"
      Synonyms: password watchword word parole
2. a second confirming signature endorsing a document already signed
      Synonyms: countersignature

Verb

1. add one's signature to after another's to attest authenticity; "You must countersign on this line of the contract"

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