Definition of "overact" []

• To act (a dramatic role) with unnecessary exaggeration. (verb-transitive)
• To exaggerate a role; overplay. (verb-intransitive)
• To act over and above what is required; overdo in acting. (verb-intransitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "While his later tendency to overact is sometimes apparent, young pre-Star Trek Shatner is, dare I say, rather dashing."
• "But Tarun (who directed Thimuru and Kaalai) has to learn not to overact, which is apparent in one of the scenes."
• "In fact, he suggested political leaders were better to "overact" than "underact" when it comes to speeding stimulus money out the door."