旁門左道 [－门－－]

Jyutping pong4 mun4 zo2 dou6
Pinyin páng mén zuǒ dào

Definitions (CC-CEDICT)
  1. dissenting religious sect (idiom); heretical school of opinion
  2. dissident group
Definitions (粵典–words.hk)
  1. 名詞
    一​啲​唔​得​光明正大​、​下流​嘅​手段
    trickery; deviousness; underhandedness
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    trickery; deviousness; underhandedness
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）