different between unbar vs unban

English

From Middle English unbarren, equivalent to un- +? bar.

unbar (third-person singular simple present unbars, present participle unbarring, simple past and past participle unbarred)

(transitive) To unlock or unbolt a door that had been locked or bolted with a bar.
(transitive) To remove an impediment that obstructs the passage of (someone or something).
(transitive) To remove a prohibition.

un- +? ban

unban (third-person singular simple present unbans, present participle unbanning, simple past and past participle unbanned)

(transitive) To lift a ban against.
- 2004, Paul Mutton, IRC Hacks
  ChanServ can unban you from your channel when someone has banned you […]

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