/ Dictionary / Index O overact: Meaning and Definition of Find definitions for: o•ver•act Pronunciation: (ō"vur-akt'), [key] — v.t., v.i. to act in an exaggerated manner. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: overact (Thesaurus) overachieve overactive Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language