would cut clean through iron as though it were mud
As a Chinese idiom, the Pinyin is Xu ē Ti ě R ú n í, which means an exaggerated description of the sharpness of a sword. It means that it is as easy for a sword to cut iron as mud. The blade is extremely sharp. From the romance of the Three Kingdoms.
Analysis of Idioms
Synonym: new hair in hair, blowing hair can be broken
The origin of Idioms
The 41st chapter of the romance of the Three Kingdoms by Luo Guanzhong of Ming Dynasty: "that green sword is extremely sharp when it cuts iron like mud."
Idiom usage
Subject predicate; as predicate and attribute; with commendatory meaning. example although this sword can't be said, it is as sharp as huama sword. (Yao xueyin's Li Zicheng, Vol.1, Chapter 5) Ming Wumingshi's "looking for a relative. Chapter 7": "the pure steel will be beaten; it will be refined for a long time; it will be cut without blood; it will be cut like mud."
would cut clean through iron as though it were mud
strengthen the defences and clear the fields - gù bì qīng yě