Definition of "unregister" [unregister]

• To undo the process of registration for (verb)
• To undo a registration process (verb)

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• "If for some reason you must "unregister" later, please call or email the person doing the pairings for this month."
• "Um, I guess it's take to unregister for the party, eh?"
• "If you do not wish to receive such offers or announcements, you will have to unregister from our service."