Related Clues:
- Sound of steam
- Sound from a radiator
- Express disapproval as hand is seen stroking tops
- Sound from a leaking radiator
- Sound of dissatisfaction
- Sibilate
- Sound from a slithery reptile
- Villain's welcome
- Feline's warning
- Show disapproval? It's conveyed by this sound
- Express disapproval at some of this song
- Cottonmouth's warning
- Sound of a ball losing air
- Sound a ball makes while losing air
- Angry snake's sound