Related Clues:

• Horse's halter
• Stop
• 'Enough!'
• Chill
• 'Relax!'
• Rider's 'Stop!'
• 'Chill!'
• 'Stop!'
• 'Holy smokes!'
• 'No way!'
• 'Hold it!'
• 'Calm down!'
• Command to Dobbin
• 'Not so fast!'
• 'Hold up!'