Related Clues:

• "Hush!"
• Librarian's plea
• "Enough!"
• 'Shut your mouth!'
• "That's enough!"
• Library imperative
• Command to Sweet Charlotte
• "Who ___ Be Now?" (Men At Work)
• "Silence"
• Be silent
• 'Don't say a word!'
• ''Be still!''
• ''That's enough!''
• Keep concealed, with 'up'
• 'Put a sock in it!'