泥牛入海

Explanation: Clay cattle fall into the sea. Metaphor to not come back. 　　Usage: The main predicate; as predicate, attributive, clause; that there is no hope 　　Source: Song, Buddhism, Taoism original "Jingde Chuandeng recorded Tanzhou Longshan monk": "I see two Niniu bucket into the sea, until now no news." 　　Examples: Director-General of the two banks who waited a long time, just waiting for was a ~, never the message. (Qing Wu Jian-ren, "Strange two decades," the seventh back) Thesaurus:  silence, be gone like the yellow stork, Yao no story, Yao no trace, Neither hide nor trace