A person who signs a credit card or loan application agreeing to guarantee payment if the signer is unable to repay the loan. The cosigner of a loan assumes legal responsibility for the loan.
One who jointly signs a negotiable instrument with another person to assist the other signer to obtain a loan and, by doing so, assumes full liability for the loan should the other signer ever default on the loan contract. Also called a comaker. See also accommodation party and surety.