坏人跟坏人互相帮助,共同作恶。
同恶相济 [tóng è xiāng jì]
1. conspire with someone in illegal acts; aid and abet each other in wrongdoings; Evildoers collude [collaborate] with each other.; take part in a conspiracy with sb.; The wicked help the wicked.tóng è xiāng jì,同恶:共同作恶的人;济:助。坏人互相勾结,共同作恶。