To remove Saint Peter's influence or authority; a humorous or archaic term for removing papal authority.
From de- (remove) + Peter (the apostle and founder of the Catholic Church). A rare and mostly historical or humorous term from religious contexts.
This word is basically obsolete, but it shows how English speakers would playfully create words by adding 'de-' to names—it's like saying 'to un-Michael Jordan' someone, which we understand even though it's not a real word.
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