Related Clues:

• "Silence!"
• Lack of noise
• Word to a crying child
• Reaction to a big library volume?
• "Can it!"
• 'Not so loud!'
• Call for silence
• "Not another word!"
• 'Keep it down'
• "Keep it down!"
• Usher's admonition
• ... a mother with noisy kids
• "Quit whining"
• 'This is a library!'
• Library admonition