1. a person who signs a document (such as a loan agreement or lease) jointly with another person, sharing legal responsibility for the obligation
Usage: commonly used in financial and legal contexts

Examples

• My parents agreed to be cosigners on my student loan.
• The landlord required a cosigner because the tenant had no credit history.
• As a cosigner, you are legally responsible if the borrower fails to repay the debt.
• She asked her brother to be a cosigner on the car loan.
• The bank will not approve the mortgage without a cosigner.
• Both the primary borrower and the cosigner must sign the contract.