Meaning:

You use this proverb to say that you shouldn't worry about something that has already happened.
It is no use being angry over or upset about something that has already happened and/or you cannot change.

Example:

I failed the exam, but it's no use crying over spilled milk. I'll try it again.

You've broken the vase now! There's no use crying over spilt milk. We will buy a new one.

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