Related Clues:

• 'Uncle!'
• Admonisher's word
• Octagon inscription
• Octagonal sign
• Cry from a tickled person
• Word on the street
• Terse warning
• 'I'd advise against it'
• Telegram punctuation
• What to do if you see red
• Parent's warning
• Obey a red light
• Organ component
• Where to get off?
• Take a break