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English definition of “underachiever”

underachiever

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