To wag one's tongue, often to instigate discord, spread rumors, or to show off rhetorical skill, sometimes with negative connotations of glibness or manipulation.
他总是喜欢在背后摇吻鼓舌，挑拨离间，让大家都不愉快
He always enjoys wagging his tongue behind others' backs, stirring up trouble and making everyone uncomfortable.
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