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

overachiever

noun
 
/ˌəʊvərəˈtʃiːvə(r)/
 
/ˌəʊvərəˈtʃiːvər/
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  1. a person who does better than expected in their studies or work
  2. a person who tries too hard to be successful in their workTopics Successc2
See overachiever in the Oxford Advanced American Dictionary
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