Possible Clues:

• Still good advice to the excited
• Render motionless from lack of wind
• Make quiet or still - sounds like an order
• Make it so that it won't come to blows
• Don't get the wind up!
• Don't get the wind up, perhaps
• ''Chill out!''
• 'Stop panicking!'
• Deprive of air? Don't panic
• ''Chill!''