Leaky radiator sound
Else clues• Adder's warning
• Air hose sound
• Air-leak sound
• Alarming sound for a hot air balloonist
• Asp's sibilance
• Background noise at a cookout
• Bacon sizzle
• Deflation indication
• Flat sound
• Flat statement?
• Flat tire indicator
• Frightening sound for a balloonist
• Indication of deflation
• Kettle sound
• Leak sound
• Leaky radiator noise
• Leaky tire sound
• Not a good sound for a balloonist
• Plurals sometimes
• Puncture sound
• Radiator or kettle sound
• Radiator sound
• Scary sound for a balloonist
• Slow leak's sound
• Slow-leak sound
• Snake's warning
• Snaky warning
• Sound from a leaky tire
• Sound from a sizzling pan
• Sound from a snake pit
• Sound of a basketball losing air
• Sound of a leak
• Sound of a live wire
• Sound of a slow leak
• Sound of air escaping
• Sound of air leaving a basketball
• Sound of an air leak
• Steam sound
• Tire leak sound
• Unwanted letters on a boarding pass
• Unwelcome boarding-pass marking
• Unwelcome sound to a driver
• What a balloonist hates to hear
• What's missing from the theme entries
• Worrisome sound for a balloonist