ふくすいぼんにかえらず
what's done is done; it is no use crying over spilt milk; spilt water won't go back into its tray
Also written 覆水盆に帰らず
Expression
覆水盆ふくすいぼんに返かえらず。
What is done cannot be undone.
諺ことわざに、覆水盆ふくすいぼんに返かえらずと言いう。
The proverb says that what is done cannot be undone.