抽梁换柱

Explanation: Analogy secret mischief, to leave on behalf of the real 　　Usage: Joint type; as object, attribute; with a derogatory sense, with the substitution 　　Source: Qing Li Ruzhen "Flowers in the Mirror" 91 back: "I will not tell a joke, had to change the line a pumping beam column Xiaoling." Thesaurus:  imposture remarry after the death of one's wife