Related Clues:

• Quiet please
• Gag order?
• 'Not a word!'
• 'No noise!'
• (Call for) quiet
• Make (someone) quiet
• Ultimately, libraries quiet, so keep the noise down!
• Noiselessness
• Even parts of The South turned calm
• Theater sound
• Theater reproof
• "Quiet down!"
• Silencer's sound
• Reprimand in a movie theater
• Librarian's rebuke