Related Clues:
- Grievance
- Talk indistinctly
- Cooing sound
- Speak in a low tone
- Say your lines a la Brando
- Speak indecipherably, perhaps
- Complain, in a way
- Speak in low voice
- Murmur in discontent
- Low continuous sound
- Speak in a low voice, whisper
- Low, continuous sound
- Abnormal sound made by heart
- Moan
- Speak indistinctly, fail to articulate