cosign

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cosign

v. to sign a promissory note or other obligation in order to share liability for the obligation.

cosign

verb accredit, answer for, approve, assure, authorize, back, be surety for, certify, confirm, countersign, endorse, give assurance, give one's signature, guarantee, indorse, insure, promise, ratify, secure, support, undersign, underwrite, validate, vouch for
Associated concepts: accommodation indorser, accommooation party
See also: indorse, witness