Definition of "unsubscribe"

unsubscribe

verb
third-person singular simple present unsubscribes, present participle unsubscribing, simple past and past participle unsubscribed
1. (intransitive) To cancel a subscription, especially to an online service.
noun
plural unsubscribes
1. An unsubscription.
  Quotations
  Given how easy it is to filter messages or simply delete them, unsubscribes are significant events. Taken together, these metrics can tell you a lot about the quality of the email you're sending and provide the basis for testing your customer lists […]
  2005, Eric T. Peterson, Web Site Measurement Hacks