Related Clues:

• When repeated, not to be repeated
• Mum's the word
• ''Shut up!''
• "Pipe down!"
• Stunned response
• Stillness
• Teacher's command
• "Quiet!"
• 'Quiet down!'
• "Hush!"
• "Enough!"
• 'Shut your mouth!'
• "That's enough!"
• Command to Sweet Charlotte
• "Who ___ Be Now?" (Men At Work)