American English

Definition of oh exclamation from the Oxford Advanced American Dictionary

      

    oh

     exclamation
    (O) exclamation
    NAmE////
     
     
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  1. 1 used when you are reacting to something that has been said, especially if you did not know it before “I saw Ben yesterday.” “Oh yes, how is he?” Oh dear! What's happened now? You can't come tonight? Oh well, see you next week then. “Erica has a new job.” “Oh, she does?”
  2. 2used to express surprise, fear, joy, etc. Oh, how wonderful! Oh no, I've broken it!
  3. 3 used to attract someone's attention Oh, Sue! Could you help me for a minute?
  4. 4used when you are thinking of what to say next I've been in this job for, oh, about six years.
See the Oxford Advanced Learner's Dictionary entry: oh