what's done is done

Idioms  

1. 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.

---

Example Sentences

What’s done is done, and the season autopsy can wait until the summer.

From Los Angeles Times

“What’s done is done, we believe,” she said.

From Salon

What’s done is done, of course, but there may be a larger benefit in your future.

From Los Angeles Times

She said: “I found out from a lot of my friends that it happened to them too. I’m a bit annoyed, but what’s done is done.”

From BBC

"I'm devastated and what's done is done," she says.

From BBC