Related Clues:

• Sound of air escaping
• Leaky tire sound
• Warning from Fluffy
• Deflation indicator
• Leak giveaway
• Radiator noise
• Sibilant boo
• Steam sound
• Sounds from a snake pit?
• Evince displeasure
• Greet a villain
• Express displeasure
• React like a cat
• Sound from an angry cat
• Cobra's greeting