How would a lender be able to call in an entire loan based on the borrower's default of one payment?

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The lender would be able to call in an entire loan based on the borrower's default of one payment through the acceleration clause. This clause states that upon default of a certain condition (such as missing a payment), the lender has the right to demand immediate repayment of the entire loan. This is also known as "accelerating" the loan.

How Would a Lender Be Able to Call in an Entire