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Jyutping tin1 lok6 hung4 jyu5 , maa5 sang1 gok3
Pinyin tiān luò hóng yǔ , mǎ shēng jué

Definitions (Wiktionary)
  1. phrase, Hokkien, idiomatic
    when pigs fly
    (syn.) 天落紅雨, 天落红雨, 馬發角, 马发角