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Meaning of underachiever

un•der•a•chiev•er

Pronunciation: (un"dur-u-chē'vur), [key]
— n.
  1. a student who performs less well in school than would be expected on the basis of abilities indicated by intelligence and aptitude tests, etc.
  2. a person or thing that performs below expectations.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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