verb (used without object), o·ver·a·chieved, o·ver·a·chiev·ing. 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 Related forms o·ver·a·chieve·ment, noun
o·ver·a·chiev·er, noun