what's done cannot be undone
Synonym of what's done is done.
undone
UK /ʌnˈdʌn/ US /ʌnˈdʌn/
adj 3
Definitions
adj
1
Not done.
Even so, it was found necessary to leave certain tasks undone.
adj
1
Not fastened.
Your flies are undone.
2
Ruined; brought to nought.
Woe is me, for I am utterly undone!
Your hopes are murdered and undone.
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