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Unregister (verb)
To undo the process of registration for.
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Unregister (verb)
To undo a registration process.
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Deregister (verb)
to unregister
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Deregister (verb)
to unsubscribe
Wiktionary
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Deregister (verb)
remove from a register
“scores of patients have been deregistered by the practices”
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Deregister (verb)
remove one’s name from a register
“he should deregister for VAT purposes”
Oxford Dictionary