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During the Western Han Dynasty, after the rebellion of the Seven Kings of Wu and Chu, Emperor Wu implemented various measures to restrict the feudal lords, ensuring the central government's power surpassed that of the princes.
To maintain balance among the feudal kings, he invited them to a feast. During the banquet, melancholic music was played. Liu Sheng, the Prince Jing of Zhongshan, sorrowfully confided his hope that the emperor would not readily believe slanderous remarks.
He warned that 'gathering mosquitoes to form thunder' (聚蚊成雷) could allow rumors to severely damage the relationship among brothers and within the royal family.

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Open the tool →聚蚊成雷 (jù wén chéng léi) is a Chinese idiom (chengyu) meaning “a multitude of seemingly minor and persistent rumors or slanderous remarks can accumulate and cause significant, thunderous harm, often ruining a person's reputation or creating major discord”.
聚蚊成雷 is pronounced jù wén chéng léi in Mandarin Chinese.
Literally, 聚蚊成雷 means “Mosquitoes gathering to form thunder”. It is used to mean “a multitude of seemingly minor and persistent rumors or slanderous remarks can accumulate and cause significant, thunderous harm, often ruining a person's reputation or creating major discord”.
聚蚊成雷 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
许多蚊子聚到一起,声音会象雷声那样大。比喻说坏话的人多了,会使人受到很大的损害。