木已成舟

Explanation: Trees have been turned into a boat. Metaphor thing is a foregone conclusion, can not be changed. 　　Usage: The main predicate; as predicate, attributive, clause; neutral term 　　Source: Qing Xia's "Ye Sou Pu Yan": "According to you, the die was cast, it is difficult to restore it?" 　　Riddle: Hang Hang converted Thesaurus:  one Not return to, what's done cannot be undone, Turn traitor No, fait accompli (noun), Ma ago splash, adage, come to stay