Final answer:
When a guarantor's promise is secondary, it means their obligation to repay the loan is contingent upon the primary borrower's default.
Step-by-step explanation:
In the context of contracts and loan agreements, a guarantor is someone who agrees to be responsible for the obligations of another person in case they default on their loan or fail to fulfill their contractual obligations. When a guarantor's promise is described as secondary, it means that their obligation to repay the loan is contingent upon the primary borrower's default.
For example, if a student takes out a student loan and a parent acts as a cosigner, the parent's promise to repay the loan is secondary. They will only be responsible for the debt if the student fails to make the required payments. The primary borrower, in this case, is the student, and the guarantor's promise is secondary.