verb (used with object), verb (used without object)
to act in an exaggerated manner.

1605–15; over- + act

overaction, noun
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World English Dictionary
overact (ˌəʊvərˈækt)
Also: overplay to act or behave in an exaggerated manner, as in a theatrical production

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1611, "to go too far in action," from over + act (q.v.). Meaning "to play a part with too much emphasis, to chew the scenery" is from 1631.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The other dancers in her company tend to overact too.
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