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Douglas Harper's Etymology Dictionary
over-achiever

also overachiever, 1953, from over- + agent noun of achieve (v.). Related: Over-achieve; over-achieving.\n

Wiktionary
over-achiever

n. (alternative spelling of overachiever English)

Usage examples of "over-achiever".

Poole could not resist a little amateur psychoanalysis: small people were often aggressive over-achievers - which, from Indra Wallace's hints, appeared to be a good description of Ganymede's sole resident philosopher.