削铁如泥

Explanation: Chop chop cutting iron, as the same soil. Described Weaponry extremely sharp. 　　Usage: The main predicate; as the predicate attribute; with compliment 　　Source: Ming Luo, "Three Kingdoms" forty blunt sword cut back to that green iron drunk, very sharp. " 　　Examples: This is not to say ~ mouth sword, sharp sword may also wish to take horse. ★ Yao Xueyin "Rereading," Volume I Chapter Thesaurus:  Emerging in whetstone, Hair can be broken, New whetstone