a long, bitter argument or fight between two people or groups that lasts for a long time.
From Old French feu, related to medieval feudal systems. In feudal societies, land disputes led to persistent family conflicts, so the word came to mean any prolonged quarrel.
The Hatfield-McCoy feud is one of America's most famous, lasting over 100 years and killing at least 13 people—it started from a pig dispute, showing how small conflicts can spiral without reconciliation.
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