Related Clues:

• Button it!
• "Cut the chatter!"
• "Hush"
• "Shaddap!"
• Audible silencer
• Peremptory signal
• Quiet "Quiet!"
• ''Put a sock in it!''
• "That's enough from you!"
• Warning that often precedes 17-, 30-, 49- and 65-Across
• Quiet please
• Gag order?
• 'Not a word!'
• 'No noise!'
• (Call for) quiet