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Jyutping ng6 jan4 zi2 dai6
Pinyin wù rén zǐ dì

Definitions (CC-CEDICT)
  1. (of a lazy or incompetent teacher) to hamper students' progress
  2. (of media) to propagate errors
  3. to lead people astray
Definitions (粵典–words.hk)
  1. 動詞
    形容​一​啲​自己​都​一知半解​,​或者​唔​識教​書​嘅​人​,​走​去​教導​其他人
    (of teachers) to mislead the younger generation; to set a bad example
    • 個老師好差,根本就係誤人子弟。
      个老师好差,根本就系误人子弟。
      go3 lou5 si1 hou2 caa1, gan1 bun2 zau6 hai6 ng6 jan4 zi2 dai6.
      The teacher is very bad, basically misleading the younger generation.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to lead students astray
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    这套教材简直是误人子弟。
    這套教材簡直是誤人子弟。
    zhè tào jiào cái jiǎn zhí shì wù rén zǐ dì 。
    • These learning materials are less of a help to pupils and more of a hindrance.
Examples (粵典–words.hk)
  1. Cantonese
    个老师好差,根本就系误人子弟。
    個老師好差,根本就係誤人子弟。
    go3 lou5 si1 hou2 caa1, gan1 bun2 zau6 hai6 ng6 jan4 zi2 dai6.
    • The teacher is very bad, basically misleading the younger generation.
Examples (Wiktionary)
  1. Mandarin
    误人子弟
    誤人子弟
    wù rén zǐ dì
    • to lead young people astray