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countersign

Definitions of countersign
  1. verb
    add one's signature to after another's to attest authenticity
    “You must countersign on this line of the contract”
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    type of:
    sign
    be engaged by a written agreement
  2. noun
    a second confirming signature endorsing a document already signed
    synonyms: countersignature
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    type of:
    signature
    your name written in your own handwriting
  3. noun
    a secret word or phrase known only to a restricted group
    synonyms: parole, password, watchword, word
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    type of:
    arcanum, secret
    information known only to a special group
    positive identification
    evidence proving that you are who you say you are; evidence establishing that you are among the group of people already known to the system; recognition by the system leads to acceptance
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