Related Clues:

• ''No more talk!''
• Exam proctor's reminder
• 'Quit your jibber-jabber!'
• "It's a secret"
• Admonition in a library
• Theater rebuke
• 'Inside voices!'
• “Quiet down!”
• "It's a secret!"
• ''Button it!''
• Reaction to someone tapping a microphone, maybe
• Librarian’s exhortation
• Library caution
• “Button it!”
• "Oh, be quiet"