Used attributively before a noun to denote something relating to a cosigner.
Definitions
cosignernoun
A person who signs an official document, such as a loan agreement, with another person, thereby agreeing to be responsible for the debt if the primary borrower fails to pay.
The bank required a cosigner for the student loan to ensure that the payments would be made on time.
cosigneradjective
Relating to or involving a cosigner.
The cosigner obligations remain even if the primary borrower defaults.