write (a debt / money) off
Definition: to accept that you are not going to receive the money someone owes you.
E.g.1: That company has serious financial problems. I don’t think they will pay us the money they owe us, so we should write it off.
E.g.2: Many people think that the World Bank should write off the debts of developing countries.
This phrasal verb can be separated (E.g. 1)