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 forAssociated concepts: accommodation indorser, accommooation party
See also: indorse, witness