(transitive) To mark something (such as a used postage stamp) so that it can't be reused.
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(transitive) To cross out something with lines etc.
He cancelled his order on their website.
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(transitive) To invalidate or annul something.
"I don't know what your agreement was, Herr Professor, but if it had money in it, cancel it. I want him to learn that lesson, too."
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