tell tales; make mischief; sow discord
sow discord among one's friends
Even if a villain secretly sow discord, but they are always a good brother, loyal to each other.
Following the interlocking stratagems they had laid, Wang Yun Betrothed his step daughter Diao Chan to Lu Bu, then, to sow discord Between the two, presented the girl to Dong Zhou as a concubine.
To this end, the beauty unit, also warned the employees so that they do not sow discord in front of me.