低声 + Verb
The adverb 低声 (dīshēng) means "in a low voice" or "softly." It is used before verbs of speaking to indicate that something is said quietly or in a whisper. For example, 低声说 means "said in a low voice."
他低声对我说:"别让别人听见。"
Tā dīshēng duì wǒ shuō: "Bié ràng biérén tīngjiàn."
He whispered to me, "Don't let anyone else hear."
她低声叫了他的名字,怕吵醒孩子。
Tā dīshēng jiào le tā de míngzì, pà chǎoxǐng háizi.
She called his name in a low voice, afraid of waking the child.
两个人在角落里低声商量着什么。
Liǎng gè rén zài jiǎoluò lǐ dīshēng shāngliáng zhe shénme.
The two of them were whispering about something in the corner.