verb
to reverse or undo an event or occurrence, to make something not happen
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It is impossible for the event to unhappen as it has already occurred.
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There's no way to make what happened unhappen, so we have to deal with the consequences.
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We can't just snap our fingers and make it all unhappen, unfortunately.
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Sometimes I wish I could press rewind and make it all unhappen, but life doesn't work that way.