Related Clues:

• They may be sworn
• Nemeses
• Formidable rivals
• They're hostile to you
• Unbeatable archenemies
• USC and UCLA, e.g.
• Opposed combatants
• Hostile parties
• Holmes and Moriarty, e.g.
• Battling sides
• Usually unbeatable rivals
• Archenemies
• People on a Nixon list
• They're against us
• They're not for you