Definition
To behave or speak in a false or artificial way, often to deceive or impress others.
裝腔作勢
He's always putting on an act, making it hard to believe he's sincere.
他總是裝腔作勢，讓人很難相信他是真誠的。
Stop putting on an act; we all know you actually like it.
別再裝腔作勢了；我們都知道你其實喜歡。
She was clearly nervous, but she put on an act of being calm.
她顯然很緊張，但她裝作很冷靜。