Related Clues:

• Order at sea
• Danger
• Cautionary word
• 'Freeze!'
• "I forbid you!"
• Horse halter?
• Sailor's stop
• Halt, to a salt
• Put a stop to
• 'Amazing!'
• Roadblock demand
• 'Cease and desist'
• Nautical command
• Discouraging word
• Stop suddenly