Related Clues:

• Expression of disapproval
• Cry of derision
• It might make you start
• Boo's sidekick
• Opposite of cheer
• Blow off steam?
• 'That stinks!'
• Flat sound
• Derisive shout
• Ghost's cry
• Sob syllable
• Example of scare tactics
• Sound of escaping air
• Call from the bleachers
• Kin of 58-Across