To continuously mumble or murmur in a low voice, often expressing discontent, complaint, or self-pity.
小孩子不高兴的时候，总是嘟嘟哝哝地抱怨零食太少。
When the child is unhappy, they always mumble complaints about not having enough snacks.
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To continuously mumble or murmur in a low voice, often expressing discontent, complaint, or self-pity.