Refers to the historical incident at the Hongmen Banquet in 206 BC where Xiang Zhuang performed a sword dance as a pretext to assassinate Liu Bang.

项庄舞剑，意在沛公，是鸿门宴中最为人熟知的故事情节。

A figurative description of an elaborate deception or diversionary tactic used to hide a malicious intent or hidden agenda.

对方在这个时候突然降价，我看是项庄舞剑，意在把我们赶出市场。