To whisper and chatter, often with the implication of gossiping, spreading rumors, or stirring up trouble.
小明和几个同学在教室后面嘁嘁嚓嚓地议论着什么，老师走过去他们才停下。
Xiao Ming and a few classmates were whispering and chattering at the back of the classroom. They only stopped when the teacher walked over.
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