突然袭击

Explanation: Originally referred to the military by surprise attack, a sudden increase is more than metaphor in other people's actions surprising and difficult to cope. 　　Usage: Partial official; as predicate, object; a military surprise attack on 　　Examples: Comrades can not engage in ~. Thesaurus Group:  start an undeclared war yonglishuai, jump, violently, alow dash, dive, anticlimax Antonym Group:  After the real harbinger, execute the criminal first and report to the emperor afterwards— act first and report afterwards, Xianzhanhouwen, take strong measures only after courteous ones fail