马前泼水

Pinyin: mǎ qián pō shuǐ Usage: 偏正式；作宾语；含贬义 Explanation: 比喻夫妻离异，无法挽回 Source: 钱钟书《围城》：“虽然‘马前泼水’，居然‘破镜重圆’。” Thesaurus:  one Not return to, what's done cannot be undone, The die is cast., Turn traitor No, fait accompli (noun), adage, come to stay