同恶相济 Collusion of evildoers
Explanation
同恶相济是指坏人互相勾结，共同作恶。它强调了恶人之间的相互依赖和合作，以及他们共同实施犯罪行为的紧密联系。
Tong'e xiangji refers to bad people colluding with each other and doing evil together. It emphasizes the mutual dependence and cooperation between evildoers, and their close connection in committing criminal acts.
Origin Story
话说三国时期，曹操手下谋士郭嘉，才智过人，深得曹操器重。一日，曹操问郭嘉：“现在各地诸侯割据，你认为谁对我的威胁最大？”郭嘉沉思片刻，答道：“现在最大的威胁是刘备。刘备虽然表面仁义，但暗中却与许多心怀鬼胎的英雄豪杰联系，同恶相济，暗中图谋不轨。他广结善缘，结交许多有才能的人，这些人都以刘备为首，为他出谋划策，这才是真正可怕的地方。”曹操听后，深以为然，开始警惕刘备，最终也为蜀汉的崛起埋下了伏笔。
In the Three Kingdoms period of China, Cao Cao had a brilliant strategist named Guo Jia, who was highly valued by Cao Cao. One day, Cao Cao asked Guo Jia, "Now that the princes of various places are separated, who do you think poses the greatest threat to me?" Guo Jia pondered for a moment and replied, "The greatest threat now is Liu Bei. Although Liu Bei appears righteous on the surface, he secretly connects with many heroes and strong men with ulterior motives, colluding with each other and secretly plotting treason. He makes many good relationships and befriends many talented people; these people all take Liu Bei as their leader and strategize for him. This is the truly terrifying part." After hearing this, Cao Cao deeply agreed and began to be wary of Liu Bei, ultimately laying the groundwork for the rise of Shu Han.
Usage
该成语常用于形容坏人互相勾结，共同作恶的情况，多用于贬义。
This idiom is often used to describe the situation where bad people collude with each other and do evil together, mostly used in a derogatory sense.
Examples
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这伙歹徒同恶相济，无恶不作。
zhè huǒ dǎitú tóng'è xiāngjì, wú'è bùzuò
This gang of villains colluded with each other and did all sorts of evil.
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他们同恶相济，最终难逃法网。
tāmen tóng'è xiāngjì, zuìzhōng nántáo fǎwǎng
They colluded with each other and finally couldn't escape the law net.