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Jyutping hak1 jyu5
Pinyin hēi yǔ

Definitions (粵典–words.hk)
  1. 名詞、香港
    黑色​暴雨​警告​信​號​嘅​簡​稱​,​係​香港​天文台​發​出​嘅​高​級​暴雨​警告​,​表示​廣泛​地區​錄得​或者​預料​雨量​超過​每小時​70​毫米​,​而且​雨勢​可能​持續
    black rainstorm signal; literally "black rain"
    • 就嚟掛黑雨喇!仲唔返屋企?
      就嚟挂黑雨喇!仲唔返屋企?
      zau6 lai4 gwaa3 hak1 jyu5 laa3! zung6 m4 faan2 uk1 kei5?
      The black rainstorm signal will be hoisted soon, why don't you go home?
Definitions (Wiktionary)
  1. noun, Hong-Kong
    black rainstorm warning signal
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

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Jyutping haak1 jyu5
Pinyin hēi yǔ

Definitions (粵典–words.hk)
  1. 名詞、香港
    黑色​暴雨​警告​信​號​嘅​簡​稱​,​係​香港​天文台​發​出​嘅​高​級​暴雨​警告​,​表示​廣泛​地區​錄得​或者​預料​雨量​超過​每小時​70​毫米​,​而且​雨勢​可能​持續
    black rainstorm signal; literally "black rain"
    • 就嚟掛黑雨喇!仲唔返屋企?
      就嚟挂黑雨喇!仲唔返屋企?
      zau6 lai4 gwaa3 hak1 jyu5 laa3! zung6 m4 faan2 uk1 kei5?
      The black rainstorm signal will be hoisted soon, why don't you go home?
Examples (粵典–words.hk)
  1. Cantonese
    黑雨𠮶时,学童应该留系屋企。
    黑雨嗰時,學童應該留係屋企。
    hak1 jyu5 go2 si4, hok6 tung4 jing1 goi1 lau4 hai2 uk1 kei2.
    • During the black rainstorm signal, pupils should stay at home.
  2. Cantonese
    落咁大雨,黑雨都似。
    落咁大雨,黑雨都似。
    • It's raining so heavily, looks like black rainstorm signal.
  3. Cantonese
    就嚟挂黑雨喇!仲唔返屋企?
    就嚟掛黑雨喇!仲唔返屋企?
    zau6 lai4 gwaa3 hak1 jyu5 laa3! zung6 m4 faan2 uk1 kei5?
    • The black rainstorm signal will be hoisted soon, why don't you go home?