Related Clues:

• Shut up
• Librarian's admonition
• ''Quiet!''
• ''Enough!''
• 'Be quiet!'
• 'Zip your lip!'
• Librarian's demand
• When repeated, not to be repeated
• Recital rebuke
• Mum's the word
• ''Shut up!''
• Audience utterance
• "Pipe down!"
• Stunned response
• Stillness