to write to an organization or a company, usually in order to ask them to send you sth; to decide that sb / sth is a failure or not worth paying any attention to
write off / away (to sb / sth) (for sth)
to write to an organization or a company, usually in order to ask them to send you sth
I've written off for the catalogue.
write sb / sth off (as sth)
to decide that sb / sth is a failure or not worth paying any attention to
write sth off
to cancel a debt; to recognize that sth is a failure, has no value, etc.
to write off a debt / an investment
write sth offBritish
to damage sth, especially a vehicle, so badly that it cannot be repaired
Definitions from the Oxford Advanced Learner's Dictionary, 9th edition