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third-person singular simple present unspills, present participle unspilling, simple past and past participle unspilled or unspilt
(transitive) Hypothetically, to undo the spilling of. quotations examples
If the coffee is currently being spilled, I can't unspill it. And here's the kicker. You can't change the future, because it hasn't happened yet.
2016, David Zelman, If I Can, You Can: Transformation Made Easy