Definition of overachiever noun from the Oxford Advanced Learner's Dictionary

     

    overachiever

     noun
    noun
    BrE BrE//ˌəʊvərəˈtʃiːvə(r)//
     
    ; NAmE NAmE//ˌoʊvərəˈtʃiːvər//
     
     
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  1. 1a person who does better than expected in their studies or work
  2. 2a person who tries too hard to be successful in their work
See the Oxford Advanced American Dictionary entry: overachiever