钉嘴铁舌

Explanation: Described fooling, has done nothing wrong, admit defeat. 　　Usage: Joint type; as object; described fooling, admit defeat 　　Source: Yuan Li Shouqing "degree Liu Tsui," the fourth off: "What can not be the next Fazuo up. Nail iron tongue, mouth, copper, iron head and the amount of eyes that have to ask Zen." 　　Examples: Bring to teach you, you one reason or another get the cold wine and eat your father? So you are not a big house, saying you have to ~. (Minglan Ling Xiao Xiao Sheng, "Jin Ping Mei" thirty-back) Thesaurus:  Bulanzhishe, Beak steel teeth