当头棒喝

Explanation: Zen Buddhist novice monk who often received a blow with a stick or a yell, and promoting his wake. Analogy stern warning, prompting people awakened over. 　　Usage: Partial official; as subject, object; used for written language 　　Source: Puji Song Interpretation "Yun Huang Bo Wu Deng Hui Yuan Yi Xuan Rinzai Zen Zen Master Fasi": "the Church, the monks asked: 'How is the Buddha to the effect?' Division put up Calamagrostis, monks would drink, the division will have to play." 　　Examples: ~ Those criminals that we should immediately stop all illegal and criminal activities. Thesaurus:  a head-on blow, Bell Drum