Related Clues:

• Measures up to
• Parties far from festive
• The Blue and the Gray. e.g.
• Romantic triangle duo
• Unbeatable rivals
• Subjects of a Nixon list
• They can't be beaten
• Luthor and Brainiac, to Superman
• They're opposed
• Archrivals
• The Bloods and the Crips, e.g.
• Indiana and Purdue, e.g.
• Harvard and Yale, e.g.
• Arch enemies
• Exes, sometimes