Related Clues:

• Repress, in a way
• Librarian's request
• Shout from the Wizard of Oz
• Quietude
• ''Chill!''
• "Zip it!"
• "Don't panic!"
• You can break it merely by mentioning it
• Lack of sound
• "Relax"
• 'Stop panicking!'
• What's left of burnt coal
• Make quiet or still - sounds like an order
• It is golden, they say
• Render motionless from lack of wind