Related Clues:

• Ghost's call
• "Get off the stage!"
• Reaction dreaded by a performer
• "Bad call, ref!"
• "You stink!"
• Scarer's shout
• Word meant to startle
• Response that, odds are, I'm probably going to get
• Vocalize displeasure
• Spectral cry
• Partner of 20-Across
• "Eek!" elicitor
• React to an umpire's bad call
• Cry of disapproval
• Verbalized displeasure