Definition of off preposition from the Oxford Advanced Learner's Dictionary

      

    off

     preposition
    preposition
    BrE BrE//ɒf//
     
    ; NAmE NAmE//ɔːf//
     
    , NAmE//ɑːf//
     
    For the special uses of off in phrasal verbs, look at the entries for the verbs. For example take something off something is in the phrasal verb section at take.
     
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  1. 1  down or away from a place or at a distance in space or time I fell off the ladder. Keep off the grass! an island off the coast of Spain They were still 100 metres off the summit. Scientists are still a long way off finding a cure. We're getting right off the subject.
  2. 2  leading away from something, for example a road or room We live off Main Street. There's a bathroom off the main bedroom.
  3. 3  used to say that something has been removed You need to take the top off the bottle first! I want about an inch off the back of my hair.
  4. 4  away from work or duty He's had ten days off school.
  5. 5  away from a price They knocked £500 off the car.
  6. 6off of (non-standard or North American English, informal) off; from I got it off of my brother.
  7. 7not wanting or liking something that you usually eat or use I'm off (= not drinking) alcohol for a week. He's finally off drugs (= he no longer takes them).
  8. Word Origin Old English, originally a variant of of (which combined the senses of ‘of’ and ‘off’).
See the Oxford Advanced American Dictionary entry: off