Related Clues:

• "Be quiet!"
• ''Shut your mouth!''
• 'Zip your lips!'
• "Zip your lip!"
• Stand stock-still
• "Not another word out of you!"
• Refrain sung initially to floor of auditorium
• Close to silence?
• Remain perfectly still and go cold all over
• Be still shivering
• Imprison and reduce to silence
• Silence in jail!
• Don't gossip in prison?
• Order making South African quiet?
• Don't say 'confine'?