1. To clear (debt) by payment or adjustment or other settlement.

Example: Do everything possible to pay off the national debt to stabilize other economies.

2. To relieve or exempt oppression or repression (such as obligation, accusation and punishment).

Example: Ask the borrower to pay off the debt.

3. Reimbursement refers to the payment made to meet certain requirements or fulfill certain obligations or avoid punishment.

Example: Pay the rent.