overact
verb [intransitive, transitive] (disapproving)to behave in a way that is exaggerated and not natural, especially when you are acting a part in a play 举止过火；表现做作；过分夸张地表演 He's a poor actor with a strong tendency to overact. 他是个差劲的演员，有过度表演的倾向。 - overact something
She dreadfully overacted the part. 她演得太过火了。