Related Clues:

• “Use your inside voice!”
• "No talking or whispering!"
• "Be quiet now!"
• Exam proctor's reminder
• 'Quit your jibber-jabber!'
• "It's a secret"
• Admonition in a library
• “Not another word!”
• Theater rebuke
• “Quiet down!”
• "It's a secret!"
• ''Button it!''
• Librarian’s exhortation
• Library caution
• 'Don't say anything!'