what's done is done

• what's done cannot be undone

From a line of dialogue spoken by the character Lady Macbeth in Act III Scene II of Macbeth by William Shakespeare.

what's done is done

1. Events that have already taken place cannot be changed and actions that have already been committed cannot be undone, so it is best not to dwell on them.

• genie is out of the bottle
• here we are
• the die is cast
• there's no point crying over spilt milk
• yesterday is gone
• you can't go home again
• that ship has sailed