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During the Sixteen Kingdoms period, the Eastern Jin general Huan Wen led his army to attack the Former Qin state. He stationed his troops at Ba Shang but did not cross the Ba River to assault Chang'an.
Wang Meng, who was living in seclusion in Huayin Mountain, dressed in a worn-out coarse hemp garment, went to visit Huan Wen. They discussed the state of the world.
Wang Meng scratched lice while talking, completely unconcerned about his surroundings. He discovered that Huan Wen was not truly sincere, so he later went to serve Fu Jian, the King of Former Qin.

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Open the tool →扪虱而言 (mén shī ér yán) is a Chinese idiom (chengyu) meaning “to converse in a relaxed and unrestrained manner, without formality or concern for minor details; to talk freely and informally”.
扪虱而言 is pronounced mén shī ér yán in Mandarin Chinese.
Literally, 扪虱而言 means “Scratching lice and talking”. It is used to mean “to converse in a relaxed and unrestrained manner, without formality or concern for minor details; to talk freely and informally”.
扪虱而言 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
扪:摸。一面用手捉虱子,一面谈话。形容不拘细节,随便谈话。亦作“扪虱而谈”、“扪虱倾谈”。