overact

From over- +‎ act.

• IPA^(key): /ˌəʊvəɹˈækt/

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overact (third-person singular simple present overacts, present participle overacting, simple past and past participle overacted)

1. (acting) To act in an exaggerated manner.

   He overacted his part.

2. (obsolete, transitive) To act upon, or influence, unduly.
   • 1670, John Milton, “(please specify the page)”, in The History of Britain, that Part Especially now Call’d England. […], London: […] J[ohn] M[acock] for James Allestry, […] , →OCLC:

     The hope of inheritance overacts them.

• chew the scenery, ham, ham it up, melodramatize, tear a cat

• overactor