Related Clues:

• 'This is a library!'
• Library admonition
• Librarian's request
• Shout from the Wizard of Oz
• Finger-on-lips sound
• 'Keep it down!'
• Partner of peace
• Admonition to a cell phone user in a theater
• "Stop talking!"
• 'Silence!'
• "Shush!"
• Request for quiet
• Quietude
• Library demand
• Teacher's admonition