敲边鼓

to echo what sb said; to back sb up from the sidelines (in an argument)

to wave flags and shout battle cries (idiom); to egg sb on; to give support to

to strike the edge of the gong; (fig.) to stir the pot (i.e. cause or exacerbate a dispute)

vocal accompaniment in some traditional Chinese operas; to speak in support of

to back sb up; to support (from the rear)

to support; to brace