what's done is done
There is no changing something; it's finished or final. For example, I forgot to include my dividend income in my tax return but what's done is done—I've already mailed the form. This expression uses done in the sense of “ended” or “settled,” a usage dating from the first half of the 1400s.
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Example sentences from the Web for what's done is done
But the other thing that needs to be done is for us citizens to do.Ayaan Hirsi Ali: Our Duty Is to Keep Charlie Hebdo Alive|Ayaan Hirsi Ali|January 8, 2015|DAILY BEAST
Newspapers around Europe have also done so in solidarity with the slain.Why We Stand With Charlie Hebdo—And You Should Too|John Avlon|January 8, 2015|DAILY BEAST
Neither the Republican nor the Democratic party have done anything to consistently target Asian- American voters.
He made clear that he fully appreciated what the cops had done.
Because I was going more on about how things had already been done.Patton Oswalt on Fighting Conservatives With Satire|William O’Connor|January 6, 2015|DAILY BEAST
You need but will, and it is done; but if you relax your efforts, you will be ruined; for ruin and recovery are both from within.Pearls of Thought|Maturin M. Ballou
Done, says he, why let fifty of our men advance, and flank them on each wing.
By the time I had done my toilette there was a tap at the door, and in another minute I was in the salle--manger.
And is this a mere fantastic talk, or is this a thing that could be done and that ought to be done?The Salvaging Of Civilisation|H. G. (Herbert George) Wells
If it took years to do it, you shall never stir out of this house till it is done.Checkmate|Joseph Sheridan Le Fanu