A person who engages in a feud; someone involved in a prolonged quarrel or conflict.
From feud plus -er suffix meaning 'one who does.' This agent noun describes a person actively carrying on a feudal conflict, particularly in the context of family or clan disputes.
While we now say 'rival' or 'enemy,' calling someone a 'feuder' captures a specific historical identity—it meant you were locked in a blood-feud, not just a one-time fight, with obligations to avenge injuries across generations.
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