Having or showing an unreasonable attachment to your own beliefs and intolerant of those who disagree with you.
From French 'bigot,' possibly from Old Norse 'by Guð' (by God), originally a mild oath. The term evolved from meaning a sanctimonious person to describing anyone stubbornly intolerant of differing views.
The origin story is wild—it might come from Scandinavian oath-takers, but nobody's completely sure! What we do know is that medieval Europeans used 'bigot' as a kind of insult that stuck around to describe closed-mindedness.
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