speak ill of sb.讲别人的坏话
say a bad word about sb.
speak ill of someboby说某人坏话
speak highly of 称赞某人
say a bad word about sb.
speak ill of sb.
paint sb. black
run sb down (behind sb's back)
speak ill of sb (behind sb's back)
say nasty things about sb (behind sb's back)
saying bad things behind sb