Related Clues:
- Accompany musically, maybe
- Indistinct murmur
- Motor noise
- Fridge sound
- Make monotonous sound as on guitar
- Insect sound of doubt
- Sound of a bee
- Sing like a bee?
- Low sound of bad smell?
- Low continuous sound
- Nasty smell
- Make music through closed lips
- Low, continuous sound
- Make musical sound with closed lips
- If, though sound, it bled, that would have cut it down to size