资料来源 : CEDICT

lit. repair the plank road by day while secretly crossing the Wei river 渭河 at Chencang (idiom, refers to a stratagem used by Liu Bang 劉邦|刘邦 in 206 BC against Xiangyu 項羽|项羽 of Chu); fig. fein one thing while doing another/to cheat under cover of a diversion