Comaker or cosigner is a person who jointly signs a check, draft or any other negotiable instrument alongside a primary borrower of a loan. The comaker acts as a guarantor of the primary borrower and assumes liability. The comaker has a legal obligation to pay the entire amount due on the instrument, should the primary borrower default.
See also: Debtor and Creditor
[Last updated in January of 2022 by the Wex Definitions Team]