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Definition of sub noun from the Oxford Advanced American Dictionary

     

    sub

     noun
    noun
    NAmE//sʌb//
     
    (informal)
     
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  1. 1= submarine
  2. 2a substitute who replaces another player in a team He came on as sub.
  3. 3(informal) a substitute teacher
  4. 4= submarine sandwich
See sub in the Oxford Advanced Learner's Dictionary
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