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Jyutping min6 bat1 goi2 jung4
Pinyin miàn bù gǎi róng

Definitions (CC-CANTO)
  1. one's face remains calm during a crisis (idiom)
Definitions (粵典–words.hk)
  1. 語句
    表情​冇​變化​、​冇​顯露​情緒​波動
    one's face remains calm
    • 佢面不改容咁吞咗成碟蠶蟲落去。
      佢面不改容咁吞咗成碟蚕虫落去。
      keoi5 min6 bat1 goi2 jung4 gam2 tan1 zo2 seng4 dip6 caam4 cung2 lok6 heoi3.
      He kept looking calm when swallowing a whole plate of silkworms.
  2. 參看
    面不改色
Definitions (Wiktionary)
  1. phrase, idiomatic
    Synonym of 面不改色 (miànbùgǎisè, “one's facial expression remains unchanged; to remain calm”).
    (syn.) 面不改色
Examples (粵典–words.hk)
  1. Cantonese
    佢面不改容咁吞咗成碟蚕虫落去。
    佢面不改容咁吞咗成碟蠶蟲落去。
    keoi5 min6 bat1 goi2 jung4 gam2 tan1 zo2 seng4 dip6 caam4 cung2 lok6 heoi3.
    • He kept looking calm when swallowing a whole plate of silkworms.
  2. Cantonese
    李先生酒量好好,饮几杯白兰地都面不改容。
    李先生酒量好好,飲幾杯白蘭地都面不改容。
    lei5 sin1 saang1 zau2 loeng6 hou2 hou2, jam2 gei2 bui1 baak6 laan1 dei2 dou1 min6 bat1 goi2 jung4.
    • Mr. Lee has a high alcohol tolerance. He looks the same even after drinking a few glasses of brandy.