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Jyutping wai4 fei1 zok3 daai2
Pinyin wéi fēi zuò dǎi

Definitions (CC-CEDICT)
  1. to break the law and commit crimes (idiom); malefactor
  2. evildoer
  3. to perpetrate outrages
Definitions (粵典–words.hk)
  1. 動詞
    做​啲​唔​道德​或者​犯法​嘅​事
    to commit crimes; to do evil
    • 佢群埋班黑社會四圍為非作歹。
      佢群埋班黑社会四围为非作歹。
      keoi5 kwan4 maai4 baan1 haak1 se5 wui2 sei3 wai4 wai4 fei1 zok3 daai2.
      He became close with triad gangsters to do evil everywhere.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to do evil
Examples (粵典–words.hk)
  1. Cantonese
    佢群埋班黑社会四围为非作歹。
    佢群埋班黑社會四圍為非作歹。
    keoi5 kwan4 maai4 baan1 haak1 se5 wui2 sei3 wai4 wai4 fei1 zok3 daai2.
    • He became close with triad gangsters to do evil everywhere.
Examples (Wiktionary)
  1. Mandarin
    为非作歹
    為非作歹
    wéi fēi zuò dǎi
    • to do evil