as an adverb: He waved and drove off. ♦ She took her coat off and hung it up. ♦ My house is a long way off.
as a preposition: She got off the bus at the next stop. ♦ Keep off the grass. In spoken American English off of is often used instead of the preposition off, but many speakers of British English think that this is not correct.
as an adjective: This meat is definitely off – I can’t eat it. ♦ I’m having an off day.