Related Clues:

• 'That's close enough!'
• The Red Baron, to Snoopy
• 'Go no further!'
• Borderline word, perhaps
• Aaron Burr, to Alexander Hamilton, at least that one time
• Philistines, to the Israelites
• Adversary with golfer's shout not right
• Stop little Henry starting tantrum
• Stop; lame
• One alternative of a sentry's challenge
• The Riddler, to Robin
• One of 64-Across
• 26-Across, to Maxwell Smart
• Allies, to the Axis
• Cure: "Grinding ___"