HSK 7-9
交头接耳
jiāotóu-jiē’ěrto whisper to one another's ear
会议期间有人交头接耳说话。
Huì yì qī jiān yǒu rén jiāo tóu jiē ěr shuō huà.
Some people whispered to one another during the meeting.
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Appears across levels (7-9) in the HSK 3.0 word list.