murmuration

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a low continuous indistinct sound;
often accompanied by movement of the lips without the production of articulate speech
• Syn:
mutter, muttering, murmur, murmuring, mussitation
• Derivationally related forms:
mussitate (for: mussitation), murmur, murmur (for: murmuring), murmurous (for: murmur), murmur (for: murmur), murmurer (for: murmur), mutter (for: muttering), mutter (for: mutter), mutterer (for: mutter)
• Hypernyms:
sound