Overact /(?)/

O·ver·act

Overact

v. t.
  1. To act or perform to excess; to exaggerate in acting; as, he overacted his part.
  2. To act upon, or influence, unduly. [Obs.]
    The hope of inheritance overacts them.

Overact

v. i.
  1. To act more than is necessary; to go to excess in action.