1610s, "to go too far in action," from over- + act (v.). Meaning "to play a part with too much emphasis, to chew the scenery" is from 1630s. Related: Overacted; overacting.
实用例句
1. Amateur actors often overact.
业余演员往往表演过火.
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2. Declan: I'm allowed to bring girls with home but i shouldn't overact it of course.