unbishop
To deprive (e.g. a city etc.) of a bishop.
transitive
To deprive (a clergyman) of episcopal dignity or rights.
transitive
Then he unbishops himself.
Where it comes from
From Middle English *unbishopen (suggested by past participle unbishoped, unbisschoped), equivalent to un- + bishop.
Adapted from the Wiktionary entry unbishop (CC BY-SA 4.0).