拉大旗作虎皮 [ㄌㄚ ㄉㄚˋ ㄑㄧˊ ㄗㄨㄛˋ ㄏㄨˇ ㄆㄧˊ; la1 da4 qi2 zuo4 hu3 pi2] lit. to wave a banner as if it were a tiger skin (idiom) fig. to borrow sb's prestige to take the name of a great cause as a shield ◄ ►