名詞 muttering:

1. a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech
   同義詞：mutter, murmur, murmuring, murmuration, mussitation
2. a complaint uttered in a low and indistinct tone
   同義詞：grumble, grumbling, murmur, murmuring, mutter

動詞 mutter:

1. talk indistinctly; usually in a low voice
   同義詞：mumble, mutter, maunder, mussitate
2. make complaining remarks or noises under one's breath
   同義詞：murmur, mutter, grumble, croak, gnarl

1. Sarah was muttering away to herself as she did the washing-up.
   薩拉一邊洗碗碟一邊獨自咕噥個沒完。
2. For some time people had been muttering about the way she ran the department.
   人們對她的管理方式私下抱怨已有時日。
3. She kept on muttering to herself.
   她老是一個人嘀嘀咕咕。