Related Clues:

• "Shh!" from a mail carrier?
• Partner of peace
• "Stop talking!"
• 'Silence!'
• "Shush!"
• Library demand
• 'Shaddap!'
• "Shhh!"
• "Zip it!"
• Ironic thing to shout
• Noiseless
• Calm, hushed
• Shush! Don't make a sound
• Tranquil, calm
• Don't give anything away, by the sound of it