Related Clues:

• Bring to a halt
• 'Knock it off!'
• Block (up)
• 'Hold everything!'
• 'Halt!'
• Direction at many a corner
• ''Cool it!''
• Telegram punctuation word
• It's a sign
• Go no further
• Octagonal order
• Heed a red light
• Word on a red sign
• Period in English literature
• Familiar sign