Related Clues:

• Restraining order of a sort
• Admonition in a movie theater
• "No talking!"
• "Button it!"
• Sound in the stacks
• Quiet "Be quiet!"
• Common library sound
• Quiet "Quiet"
• 'Lower your voice, please'
• ''Button it''
• Warning to a chatty theatergoer
• "Not a sound!"
• Sound of ''Silence!''
• 'Too loud!'
• "Be still!"