Meaning of 明修栈道暗渡陈仓

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míng xiū zhàn dào àn chén cāng (Trad.: 明修棧道暗渡陳倉)
lit. following the plank road as a feint while secretly crossing the Wei river 渭河 at Chencang (成语 saw, 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