American English

Definition of sub noun from the Oxford Advanced American Dictionary

     

    sub

     noun
    noun
    NAmE//sʌb//
     
    (informal)
     
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  1. 1= submarine (1)
  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 the Oxford Advanced Learner's Dictionary entry: sub