Idiom
write off somethingwrite off (something)
1.
to accept that a debt will not be paid.
Last year the bank wrote off $17 million in bad loans.I'll probably never see the money I loaned my brother, so I guess I'll write it off.
2.
to decide that something will not be successful.
For a long time, both political parties have written off the Greens.Since they behave oddly, people tend to write them off as weirdos, but many members of the group are important business people.
3.
to charge something as a business expense.
You can write off your cell phone and all the costs of service for it.I'm giving the furniture to a local church and writing it off as a donation.