‘嚼舌根’ literally means ‘chewing the tongue root’, a vivid and slightly grotesque idiom that evokes the image of someone noisily, repetitively moving their tongue—symbolizing idle, harmful talk behind others’ backs. Though it contains the character 舌 (tongue), it’s not about physical anatomy but rather the act of speaking carelessly and maliciously, often with exaggeration or falsehoods.

This expression carries strong negative connotations and is commonly used to criticize gossip that damages reputations or stirs conflict. It appears frequently in spoken Mandarin, especially in informal or disapproving contexts—such as warning someone not to spread rumors or scolding those who do. Unlike neutral terms for ‘chatting’, 嚼舌根 always implies moral judgment: the speaker sees the gossip as petty, unkind, and socially disruptive.