countersign

Noun
  1. A secret word or phrase known only to a restricted group (synset 106686933)
    "he forgot the password"
  2. A second confirming signature endorsing a document already signed (synset 106416663)
Verb
  1. Add one's signature to after another's to attest authenticity (synset 200999477)
    "You must countersign on this line of the contract"

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