助纣为虐

Explanation: Metaphor to help the bad guys do bad things. 　　Usage: -Linked; as predicate, attributive; containing derogatory 　　Source: "Historical Records Liuhou family" now beginning to Qin, the security of their music, this so-called help for the child jie. " Thesaurus:  scrounge, glance right and left, can't say boo to a goose, fear the wolf in front and the tiger behind/ hesitate in doing something, throw something at a rat,but afraid to break the vase, play the jackal to the tiger, Wings for the tiger, Fu Wing for the tiger, Jie for the child to help, Days for the child to help Antonym Group:   go ahead bravely without looking back, plead in the name of the people, People from harm, brave the wind and the waves, break through brambles and thorns, Head not askance, be all eyes, Not evil, as the project, Do not sit in the ear, have lofty aspirations or realize it marching forward courageously, stride forward singing militant songs