串通一气 collude
Explanation
指相互勾结，沆瀣一气，同流合污。多用于贬义。
refers to people secretly working together for evil purposes.
Origin Story
在一个古老的村庄里，住着两个狡猾的商人，他们总是想方设法地欺骗村民。一次，他们串通一气，伪造了一批劣质的粮食，打算高价卖给村民。村民们对粮食的质量毫无察觉，纷纷购买。然而，事情败露后，村民们愤怒不已，将他们告上了衙门。官府经过调查，发现这两个商人串通一气，对他们进行了严惩。从此以后，村民们更加谨慎，再也没有被他们欺骗过。这个故事告诉我们，做人要诚实守信，不能为了个人利益而串通一气，做出损人利己的事情。
In an ancient village, there lived two cunning merchants who always tried to deceive the villagers. Once, they colluded and forged a batch of inferior grains, intending to sell them to the villagers at high prices. The villagers were unaware of the quality of the grain and bought it in large quantities. However, when the matter was exposed, the villagers were furious and sued them to the yamen. After investigation, the government found that the two merchants had colluded and severely punished them. From then on, the villagers became more cautious and were never deceived by them again. This story tells us that we should be honest and trustworthy and not collude for personal gain to do things that harm others and benefit ourselves.
Usage
作谓语、定语；用于坏人相互勾结
used as predicate and attributive; used for villains who collude
Examples
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他们串通一气，企图蒙骗过关。
tāmen chuàntōng yī qì, qǐtú méngpiàn guòguān.
They colluded to deceive their way through.
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这伙人串通一气，干了不少坏事。
zhè huǒ rén chuàntōng yī qì, gàn le bù shǎo huài shì
This gang worked together and committed many bad deeds