Related Clues:

• ''Cool it!''
• Telegram punctuation word
• ''Slow down!''
• Go no further
• Octagonal order
• Stop, on the trail
• Heed a red light
• Word on a red sign
• Horse-stopping exclamation
• Period in English literature
• Familiar sign
• Oater shout
• Arresting word
• ''Hold the phone!''
• What you often do on the road