冷水浇头

Explanation: Cold water poured down from the back. Analogy suffered sudden unexpected shock or stimulate, thought startled or you hope to disillusionment. With the "cold water back." 　　Source: Qing Ding, "added Jin Ping Mei" back forty: "suddenly heard that his wife came, good Yisi - Trick Bang, cold toppings." 　　Examples: He looked like poured ~, can not help but shivers, slumped against the back of the chair. ★ Yao Xueyin "Rereading," Volume I Chapter XXII