Related Clues:
- Soft noise of engine
- Express contentment
- Sound from some Persians?
- Often upset, ignoring constant mechanical noise
- Happy feline sound
- Sound of smooth running, held up by 2
- Smell badly (slang)
- How to play the kazoo
- Respond to a belly rub, say
- How to express satisfaction at a stroke?
- White noise, perhaps
- Sound of feline content
- Sound from a cat
- Sing with closed mouth
- Be catty?