覆水盆に返らず
1
what's done is done;it is no use crying over spilt milk;spilt water won't go back into its tray
諺に、覆水盆に返らずと言う。
The proverb says that what is done cannot be undone.
Other forms
覆水盆に帰らず 【ふくすいぼんにかえらず】 (word containing irregular kanji usage)