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Jyutping tit3 min6
Pinyin tiě miàn

Definitions (CC-CEDICT)
  1. iron mask (as defensive armor)
  2. fig. upright and selfless person
Definitions (粵典–words.hk)
  1. 形容詞、俚語
    剛強​正直
    firm and upright
    • 鐵面無私
      铁面无私
      tit3 min6 mou4 si1
      strictly impartial and incorruptible
Definitions (Wiktionary)
  1. noun
    iron mask, especially one used as a defensive armour
  2. noun, figuratively
    strictly impartial or upright person
Examples (粵典–words.hk)
  1. Cantonese
    包大人铁面无私,断案如神。
    包大人鐵面無私,斷案如神。
    baau1 daai6 jan4 tit3 min6 mou4 si1, dyun6 on3 jyu4 san4.
    • Justice Bao is really impartial and skillfull when solving cases.
  2. Cantonese
    铁面无私
    鐵面無私
    tit3 min6 mou4 si1
    • strictly impartial and incorruptible