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

Many borrowers apply with a cosigner to meet this requirement. — Rebecca Safier, USA Today, 28 Aug. 2026

Autopay discounts, repayment terms, in-school payment requirements, fees, hardship programs and cosigner-release policies can all affect the overall value of a loan. — Angelica Leicht, CBS News, 25 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