Related Clues:

• The sound of silence
• 'Pipe down!'
• Quiet
• 'Can it!'
• 'Be still!'
• Library sound
• 'That's enough!'
• Worked (up)
• 'Stop your gabbin'!'
• Silence
• Surprise party admonition
• Theater admonition
• Be quiet
• Library order
• When doubled, confidential