unpay

Example:He defaulted on his mortgage payment and was forced to sell his house.

Definition:to fail to comply with an obligation; not to perform as promised.

Example:She decided to skip paying the charges on her credit card.

Definition:to fail to pay (a sum of money) in a particularly casual or unrepentant way.

Example:The payment is overdue, and there are now penalties.

Definition:being later than the required or expected time, especially in paying or returning something.