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Jyutping hung4 jyu5
Pinyin hóng yǔ

Definitions (粵典–words.hk)
  1. 名詞、香港
    紅色​暴雨​警告​信​號​嘅​簡​稱​;​係​香港​天文台​發出​第二​級​嘅​暴雨​警告​,​表示​廣泛​地區​錄得​或者​預料​雨量​超過​每小時​50​毫米​,​而且​雨勢​可能​持續
    red rainstorm signal, literally "red rain"
    • 宜家掛咗紅雨,小學生唔使返學喇!
      宜家挂咗红雨,小学生唔使返学喇!
      ji4 gaa1 gwaa3 zo2 hung4 jyu5, siu2 hok6 saang1 m4 sai2 faan2 hok6 laa3!
      The red rainstorm signal has been hoisted. Primary school students need not go to school!
Definitions (Wiktionary)
  1. noun, figuratively
    fallen flower petals; falling blossoms
    (syn.) 落英, 落花
  2. noun, Hong-Kong
    red rainstorm warning signal
Examples (粵典–words.hk)
  1. Cantonese
    宜家挂咗红雨,小学生唔使返学喇!
    宜家掛咗紅雨,小學生唔使返學喇!
    ji4 gaa1 gwaa3 zo2 hung4 jyu5, siu2 hok6 saang1 m4 sai2 faan2 hok6 laa3!
    • The red rainstorm signal has been hoisted. Primary school students need not go to school!
  2. Cantonese
    今日红雨,所以中小学停晒课。
    今日紅雨,所以中小學停晒課。
    gam1 jat6 hung4 jyu5, so2 ji5 zung1 siu2 hok6 ting4 saai3 fo2.
    • Today the red rainstorm signal (is issued), so the secondary and primary schools are all suspended.