指山說磨（指山説磨）　

◎ 指山說磨 zhǐshān-shuōmò

[point to a hill and talk about grindstone—make concealed reference to something] 借此說彼。比喻有意回避正題,弄虛作假,哄騙對方

為何遠打周折,指山說磨,拿人家來比奴。——《金瓶梅詞話》