嘟囔

wǒ men tīng dào lǎo rén zǒu kāi shí zuǐ li dū nang zhe shén me

我们听到老人走开时嘴里嘟囔着什么。

We heard the old man muttering something as he walked away.

tā dū nang jǐ jù jiù zǒu le

他嘟囔几句就走了。

He mumbled a few words and went off.

qīng shēng dū nang

轻声嘟囔

murmur under one's breath

nǐ zài dū nang shá ya

你在嘟囔啥呀？

What are you mumbling about?

tā zuǐ li dū nang yě bù zhī dào zài shuō shén me

他嘴里嘟囔，也不知道在说什么。

He was mumbling to himself and was barely intelligible.

tā dū nang zhe dào le qiàn jiù zǒu le

她嘟囔着道了歉就走了。

She mumbled an apology and left.