Hello, I'm an expert in the English language and I'd be happy to help you with your question.
The correct phrase is "spilled milk." This idiom is used to refer to a situation where something bad has happened and cannot be changed or corrected. It's often used to suggest that it's not worth worrying about something that has already happened and cannot be undone.
The word "spilt" is an older variant of "spilled," and while it is less commonly used today, it is still understood. However, in modern English, "spilled" is the more commonly accepted form.
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