Related Clues:

• "No whispering!"
• Library reminder
• Silencing sound
• Be still
• "Stifle yourself!"
• Crowd silence
• "Quiet, please!"
• 'Zip it up!'
• Librarian's reprimand
• 'Quit your crying'
• ''Keep it down!''
• Finger-to-lips syllable
• "Quit your yapping!"
• 'Hush up!'
• A call for silence