to wallow in the mire with sb (idiom); to follow the bad example of others
Definitions (粵典–words.hk)
語句
加入啲衰人一齊做壞事 to associate with evil people; to go along with somebody doing evil deeds
佢經唔起引誘,選擇咗同流合污,同其他人一齊販毒。
佢经唔起引诱,选择咗同流合污,同其他人一齐贩毒。
keoi5 ging1 m4 hei2 jan5 jau5, syun2 zaak6 zo2 tung4 lau4 hap6 wu1, tung4 kei4 taa1 jan4 jat1 cai4 faan6 duk6. He couldn't resist the temptation, (so) he chose to go along with the bad lots and be a drug dealer too.
Definitions (Wiktionary)
phrase, idiomatic
to commit evil deeds together with the contemptible and evil people