摇唇鼓舌（摇脣鼓舌）　

◎ 摇唇鼓舌 yáochún-gǔshé

[flag one‘s tops and beat one‘s tongue;wag one‘s tongue and speak ill of sb.at his back] 指卖弄口才,进行游说或煽动

摇唇鼓舌,擅生是非。——《庄子·盗跖》