knowingly follow the example of a wrongdoer
As a Chinese idiom, Pinyin is Q ú NQ à Xi à oy ó u, which means to learn from the bad together. It comes from the complete biography of Er Du Mei.
The origin of Idioms
"Er Du Mei Quan Zhuan" says: "I'm afraid that this son will follow suit and do something like making friends with the powerful party, suppressing the officials in the class and losing his reputation. Will he not insult my innocence?"
Idiom usage
As a predicate or object; used in dealing with affairs. examples these bad styles should be eradicated so as not to be followed by others.
knowingly follow the example of a wrongdoer
die without fulfilling one's ambitions - jī zhì ér mò
a mantis trying to stop a chariot - táng bì dāng zhé
allow private feelings to outweigh public duty - yǐ sī fèi gōng