Used to describe a noisy and bustling scene with many people talking loudly, like the sound of boiling water in a cauldron.
鼎古代煮食器；沸沸腾。形容人群的声音吵吵嚷嚷，就象煮开了锅一样。
明·冯梦龙《醒世恒言》卷十一日午后，刘方在店中收拾，只听得人声鼎沸。”
The marketplace was a scene of people shouting and bargaining, a real "人声鼎沸" atmosphere.
Learn the next connected idiom: 人声鼎沸 (rén shēng dǐng fèi) → 沸沸扬扬 (fèi fèi yáng yáng)
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