Related Clues:

• Quarreled bitterly
• Beefed
• Quarreled
• Engaged in vendettas
• Fought for decades
• Had a long-running argument
• Carried on lasting hostility between groups
• Fought like the Hatfields and McCoys
• Carried on with private enmity
• Didn't bury the hatchet, say
• Engaged in family fights
• Fought like rappers, perhaps