Related Clues:

• Gets steamy, with 'up'
• Metaphors for uncertainties
• Gets hazy, with 'up'
• Causes of bad air days
• Obscures, with "up"
• Becomes obscure, in a way, with 'up'
• Clouds up, with 'up'
• Gets cloudy (with "up")
• Cloudy creations
• Pea-soupers
• Gets misty, with "up"
• Gets misty, with 'up'
• Mists (up)
• Mistifies?
• Steams up, with 'up'