underachieve

/ˌʌndərəˈtʃiv/
verb
  1. To perform less well than expected or than one is capable of, especially in school or work.
    • Many gifted students underachieve because they lack motivation.
    • Despite her high IQ, she continued to underachieve in math class.
    • The coach warned that the team would underachieve if they didn't practice harder.
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