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. repair the plank road by day while secretly crossing the Wei River 渭河 of Chu); fig. to feign one thing while doing another; to cheat under cover of a diversion