What is the term for a clause allowing a lender to demand full repayment upon a borrower's default?

The term that defines a clause allowing a lender to demand full repayment upon a borrower's default is known as an acceleration clause. This clause is pivotal in loan agreements as it provides financial institutions with the ability to protect their interests. When a borrower defaults, the acceleration clause gives the lender the right to accelerate the repayment schedule, making the entire outstanding loan balance immediately due and payable.

This mechanism serves as a safeguard for lenders against the risk of non-payment, ensuring they can recover their funds without undergoing a lengthy legal process. The presence of an acceleration clause thus plays a crucial role in the contractual obligations between lenders and borrowers, helping maintain the integrity of financial agreements.