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

     

    off

     adjective
    adjective
    BrE BrE//ɒf//
     
    ; NAmE NAmE//ɔːf//
     
    , NAmE//ɑːf//
     
    [not before noun]
     
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  1. 1(British English) (of food) no longer fresh enough to eat or drink This fish has gone off. The milk smells off. It's off. I think this milk is slightly off.
  2. 2off (with somebody) (informal, especially British English) not polite or friendly He was a bit off with me this morning.
  3. 3(informal, especially British English) not acceptable It's a bit off expecting us to work on Sunday.
  4. 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