SSSS

Air-leak sound

• Adder's warning

• Air hose 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 radiator sound

• 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