to whisper to one another; the sound of low-voiced chatter or grumbling

To speak in a very low voice or whisper; the sound of low, continuous murmuring.

To mumble in whispers or mutter to oneself. Also written as [[嘟嘟囔囔|嘟嘟囔囔|du1 du5 nang1 nang5]].

colloquial expression for mumbling or muttering to oneself continuously, often in complaint