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English definition of “underachiever”

underachiever

noun [C]     /ˌʌn.də.rəˈtʃiː.vər/ US  /-dɚ.əˈtʃiː.vɚ/
someone who is less successful than they should be at school or at work FailuresAccidents and disastersHigher and lower points of achievement
(Definition of underachiever noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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