cry over spilled milk
To be upset over something that cannot be fixed, often something minor. Please calm down, you're just crying over spilled milk. We already submitted the report, so we can't fix it now. A: "Why is Hannah so upset?" B: "Oh, she's just crying over spilled milk. She just ripped her stockings—she'll be fine."
cry over spilled milk
Fig. to be unhappy about what cannot be undone. (See also It's no use crying over spilled milk.) He is always crying over spilled milk. He cannot accept reality. It can't be helped. Don't cry over spilled milk.
cry over spilled milk
To regret in vain what cannot be undone or rectified.