over-achiever

overachieve

[oh-ver-uh-cheev]
verb (used without object), overachieved, overachieving.
1.
to perform, especially academically, above the potential indicated by tests of one's mental ability or aptitude.
2.
to perform better or achieve more than expected, especially by others.

Origin:
1950–55; over- + achieve, or by back formation from overachiever

overachievement, noun
overachiever, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
overachieve (ˌəʊvərəˈtʃiːv)
 
vb
(intr) to perform (for example, in examinations) better than would be expected on the basis of one's age or talents
 
overa'chiever
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

over-achiever
also overachiever, 1953, from over + agent noun of achieve.
Online Etymology Dictionary, © 2010 Douglas Harper
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