cosigner

noun

co·​sign·​er ˈkō-ˌsī-nər 

: cosignatory

especially : a joint signer of a promissory note

cosign

ˈkō-ˌsīn 

verb

Examples of cosigner in a Sentence

Both senators are cosigners of the bill.

My mother agreed to be a cosigner on my car loan.

Recent Examples on the Web

Ideally, work with a cosigner with a score of 680 or higher to improve your chances of getting approved for a student loan. — Amy Deyoung, USA Today, 24 Aug. 2026

Word History

First Known Use

circa 1903, in the meaning defined above

Legal Definition

cosigner

noun

co·​sign·​er ˈkō-ˌsī-nər 

: cosignatory

especially : a joint signer of a promissory note