防微杜渐

Explanation: Micro: small; Du: block; gradually: refers to the beginning of things. Analogy in the burgeoning bad thing when bad ideas to stop it from development. 　　Usage: Joint type; as the predicate attribute, object; with compliment 　　Source: Southern Song Fan Ye "Han Ding Hong-Chuan": "If the reform and open government responsible for bow, becoming anti-Meng Du, the fierce demon destroy, harm than blessing Minato carry on." 　　Examples: There are things that are, should be matched ~ the ban in the first place. ("Yuan Shi Zhangzhen Biography") Thesaurus:  be precautious beforehand, nip (crush,check) the matter in the bud