Etymology
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overact (v.)

1610s, "to go too far in action," from over- + act (v.). Meaning "play a part with too much emphasis, act (a part) with an extravagant and unnatural manner, chew the scenery" is from 1630s. Related: Overacted; overacting.

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Definitions of overact

overact (v.)
exaggerate one's acting;
Synonyms: ham it up / ham / overplay
From wordnet.princeton.edu