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Definition of big league noun from the Oxford Advanced American Dictionary

     

    big league

     noun
    noun
     
    [countable]
     
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  1. 1 a group of teams in a professional sport, especially baseball, that play at the highest level
  2. 2the big league (informal) a very successful and important group Over the past year, the company has joined the big leagues.
See the Oxford Advanced Learner's Dictionary entry: big league

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