what is done cannot be undone

what is done cannot be undone

You cannot reverse, change, or take back that which has already happened. This is a delicate situation, so you can't act impulsively. Keep in mind that what is done cannot be undone.
See also: cannot, done, undone, what

what's done cannot be undone

You cannot change what has already happened or come to pass, so there's no use worrying or stressing about it; what's done is done. I know this isn't the outcome we wanted, but what's done cannot be undone, so let's just try to make the most of a bad situation. I'm really disappointed in what you did, but what's done cannot be undone—let's just forget about it now.
See also: cannot, done, undone
Farlex Dictionary of Idioms.
See also:
  • undone
  • what's done cannot be undone
  • go off at half-cock
  • go off at half-cock/half-cocked, to
  • go off half-cocked
  • go snaky
  • turning point
  • reverse gears
  • snaky
  • drive (one) snaky