Related Clues:

• 'Keep it down'
• "Keep it down!"
• 'Shut your trap!'
• “Hush!”
• Usher's admonition
• 'This is a library!'
• Library admonition
• ''Not another word!''
• Finger-on-lips sound
• 'Keep it down!'
• "Aw, shut up!"
• Admonition to a cell phone user in a theater
• "Stop talking!"
• "__ be?": "Is that possible?"
• 'Silence!'