Related Clues:

• "Who goes there, friend or ___?"
• Cassius, to Caesar
• Monopolist's lack
• Grant, to Lee
• Mudslinging target
• Them, often
• Adversary or foe
• Am archaic enemy
• An archaic enemy
• Foe or competitor
• Competitor or adversary
• Challenger, competitor
• Adversary, antagonist
• Competitor, challenger
• Adversary, competitor