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Jyutping faan2 min6 gaau3 coi4
Pinyin fǎn miàn jiào cái

Definitions (CC-CEDICT)
  1. negative example
  2. sth that teaches one what not to do
Definitions (CC-CANTO)
  1. negative example (to learn)
Definitions (粵典–words.hk)
  1. 名詞
    唔​應該​學習​、​模仿​嘅​人​或事物​(​量​詞​:​個​)
    bad example; anti-role model
    • 篇文又長又唚,係作文嘅反面教材。
      篇文又长又唚,系作文嘅反面教材。
      pin1 man2 jau6 coeng4 jau6 cam3, hai6 zok3 man2 ge3 faan2 min6 gaau3 coi4.
      This essay is long and wordy. It's a bad example for writing.
  2. 反義詞
    榜樣、模範
Definitions (Wiktionary)
  1. noun
    negative example; example of what not to do
Examples (粵典–words.hk)
  1. Cantonese
    篇文又长又唚,系作文嘅反面教材。
    篇文又長又唚,係作文嘅反面教材。
    pin1 man2 jau6 coeng4 jau6 cam3, hai6 zok3 man2 ge3 faan2 min6 gaau3 coi4.
    • This essay is long and wordy. It's a bad example for writing.
  2. Cantonese
    反面教材
    反面教材
    faan2 min6 gaau3 coi4
    • negative example