countersign

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Countersign

The inscription of one's name at the end of a writing, done by a secretary or a subordinate, to attest to the fact that such a writing has been signed by a principal or a superior, thereby vouching for the genuineness of the signature. To write one's name at the end of a document—in addition to the inscription of a name by another—to attest to the authenticity of the signature.

countersign

verb certify, confirm, corroborate, execute, ratify, sanction, second, support
See also: attest, certify, confirm, corroborate, cosign, indorse, trademark, underwrite, witness

countersign

to sign (a document already signed by another).

COUNTERSIGN. To countersign is to sign on the opposite side of an instrument already signed by some other person or officer, in order to secure its character of a genuine paper; as a bank note is signed by the president and countersigned by the cashier.