IPA: /ˌoʊvərˈækʃən/
KK: /oʊvərˈækʃən/
An action that is done too much or in an exaggerated way, often more than what is necessary or appropriate.
The actor's overaction made the scene feel unrealistic and forced.
Overaction → It is formed from "over-" (meaning excessively or too much) and "actio" (from Latin, meaning action). The word "overaction" refers to an excessive or exaggerated action.
Think of doing something 'too much' ('over-') — that's why overaction means an exaggerated action.