Related Clues:

• 'Stifle!'
• 'Shut yo' mouth!'
• It may precede 'Don't let anyone hear!'
• "No whispering!"
• Library reminder
• Silencing sound
• Be still
• Crowd silence
• "Quiet, please!"
• 'Zip it up!'
• Librarian's reprimand
• 'Quit your crying'
• ''Keep it down!''
• Finger-to-lips syllable
• "Quit your yapping!"