main offender
The chief culprit is a Chinese idiom. Pinyin is Hu ø sh ǒ uzu ì Ku í, which means the first culprit of a crime. It comes from Zheng ruoyong's the story of jade Jue, asking for life in Ming Dynasty.
Idiom explanation
Chief: leader; chief: leader. The first offender of a crime.
The origin of Idioms
Zheng ruoyong of Ming Dynasty wrote in the story of jade Jue · asking for life: "although the godmother killed me, Juan Nu was the main culprit, and chased him."
Idiom usage
We should find out the culprit of this matter.
main offender
The people are harmed by justice - cán mín hài lǐ
appropriate sth. borrowed for the own use - jiǔ jiǎ bù guī