Related Clues:

• Grind to a halt
• Telegram "period"
• Tops a different way?
• Octagonal traffic sign
• 'Gee whiz!'
• Requiring little effort
• Call a halt to
• "Freeze!"
• "No problemo!"
• 'Uncle!'
• Foolproof
• Octagon inscription
• Octagonal sign
• A snap
• Cry from a tickled person