To delay, put off, postpone (a payment).
You should pay me now (but) I will just put it off for you until tomorrow.
If I don’t have anything to pay it with, postpone it for a while.
If they have a debt to each other they will postpone payment.
An outstanding debt, remainder (of payment).
Specifically of a dowry that has not yet been paid in full.
How much is your outstanding debt?
There still is a remainder (of payment) which they have not paid.
I still have an outstanding debt of five thousand.