Related Clues:

• Noise in a nest
• Sound before shitting on a statue, say
• Some soft words
• Sing with lips closed
• Corporate BTO
• Dovish murmur
• Smooth engine sound
• Low murmur
• Dove's remark
• Gentle murmur
• Make a dove cry
• Do like doves
• Speak pigeon?
• Pigeon sound
• Play the kazoo