What do you mean by selling your mouth?

1. Bluff. Zeng Yuanrui's song Happy Spring in my heart forever: "You are an ungrateful thief in the world. Don't sell your mouth, there are ghosts and gods. " Wei's No.1 Scholar: "I'm not selling spring peaches. If Chuntao is willing to change to war, Guan Qian will be the top spot. " The sixth sentence of the first part of Zhou Libo's "Storm": "If everyone says they dare, then come with me. Revolutionary people are not interested in selling their mouths. " 2. refers to fortune telling, divination, lectures and other businesses that rely on eloquence. The story of charity dog by Jiao first appeared: "I became a salesman because of compassion, and I changed with others at the crossroads every day." Lu Xun's lace literature criticizes businessmen: "Farmers save a few buckets of rice to sell, workers exchange their strength for money, professors sell their mouths, and prostitutes engage in prostitution, all of which are' invisible' businessmen."