Related Clues:

• They may be bitter
• Opponents
• 'Wise men learn much from ___': Aristophanes
• The other team
• The opposing team
• Them, to us
• Battle groups
• Antagonists
• You try to beat them
• Ones at the gate, maybe
• Some are bitter
• Foes
• They may be sworn
• Nemeses
• The Hatfields and the McCoys, e.g.