覆水盆に返らず
Meanings
1
what's done is done; no use crying over spilt milk
Proverb meaning that once something has happened, it cannot be undone, similar to the English 'it's no use crying over spilt milk'. The literal image is of water spilled from a basin that cannot be returned.
It's already over. As they say, what's done is done.
There's no use crying over spilt milk; regretting past mistakes won't change anything.