verb (used without object), o·ver·a·chieved, o·ver·a·chiev·ing.
- to perform, especially academically, above the potential indicated by tests of one’s mental ability or aptitude.
- to perform better or achieve more than expected, especially by others.
verb
- (intr) to perform (for example, in examinations) better than would be expected on the basis of one’s age or talents
n.also overachiever, 1953, from over- + agent noun of achieve. Related: Over-achieve; over-achieving.