Related Clues:

• Horse-stopping shout
• "Not so fast!"
• "That's incredible!"
• ''Stop, Silver!''
• Twiddle one's thumbs
• Hold-your-horses command
• Not yet 58-Down
• Serve entrees, for example
• Serve in a diner
• Restraining order
• Command to a steed
• Word of caution
• Remain on hold
• Oater ''halt!''
• What a vertical palm may mean