Cry over spilled milk
Meaning
Worry about something that already happened and cannot be changed.
Usage
Used to dismiss small regrets.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Impression from milk wasted in everyday tasks.
Proverb dating to the 17th century and still used.