what's done is done
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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.
QUIZ
GOOSES. GEESES. I WANT THIS QUIZ ON PLURAL NOUNS!
Test how much you really know about regular and irregular plural nouns with this quiz.
Question 1 of 9
Which of the following nouns has an irregular plural form?
Words nearby what's done is done
what makes one tick, whatnot, what of it?, what's, what's cooking, what's done is done, what's eating you, What's good for the country is good for General Motors, and vice versa, What's good for the goose is good for the gander, What's in a name? That which we call a rose / By any other name would smell as sweet, whatsis
The American Heritage® Idioms Dictionary
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