abrenounce
v. C2 Proficiency abre·nounce
v. to officially give up a title, a position, or a belief. It is a very old word that people rarely use today.
v. to formally renounce or relinquish a title, office, or belief. Archaic in modern usage; typically found in historical legal or religious contexts.
The king abrenounce his claim to the throne.
In the old manuscript, the knight abrenounce his loyalty to the fallen king and swear fealty to the new ruler.
The document details how the subject abrenounce his previous allegiances and formally submit to the jurisdiction of the newly established court.
Learned borrowing from Medieval Latin abrenunciare, from Latin ab- (“from”) + renuntio (“revoke”).