Definition of "overachievement" [overachievement]

• A greater than anticipated achievement (noun)

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• "He says he's worried his sexuality has let her down, and his overachievement is a compensation for it."
• "It was one of the hottest Septembers in Washington history, continuing a trend of thermal overachievement that began here months ago."
• "Revenge is a prime pop motivation and, indeed, can lie behind the manic drive to overachievement shown by many who feel themselves excluded from the mainstream."