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Jyutping fat1 jin4 gaan1
Pinyin hū rán jiān

Definitions (CC-CANTO)
  1. adv; suddenly; all of a sudden; in an instant
Definitions (粵典–words.hk)
  1. 副詞
    突然​間
    suddenly
    • 隻狗忽然間亂咁吠。
      只狗忽然间乱咁吠。
      zek3 gau2 fat1 jin4 gaan1 lyun2 gam3 fai6.
      The dog barks suddenly.
    • 我忽然間覺得好凍,係咪開大咗個冷氣?
      我忽然间觉得好冻,系咪开大咗个冷气?
      ngo5 fat1 jin4 gaan1 gok3 dak1 hou2 dung3, hai6 mai6 hoi1 daai6 zo2 go3 laang5 hei3.
      I feel cold suddenly, xxxxxxxxxxx
  2. 參看
    忽然之間
Definitions (Wiktionary)
  1. noun
    suddenly
    (syn.) 驟然, 著陌生頭, 玄工, 一下子, 忽然間, 單下, 突然, 冷陌生頭, 倏忽, 著末生頭, 一下兒, 一下, 冒冷子, 冷不防, 猛然, 失雞無神, 辣末生頭, 乍猛地, 猝然, 虎拉巴兒, 著生頭裡, 陣時間, 冒猛子, 乍然, 乍麼實兒, 臨陣, 無張無持, 暴其然, 忽聲能, 陣間, 辣陌生頭, 辣末生裡, 冒猛地, 著陌生裡, 忽然, 雄險, 無張持, 雄雄, 突乎其然, 失驚忘神, 失驚無神, 突然之間, 乍乍地, 玄玄風, 驀地, 突然間, 忽然之間, 三不臨陣
Examples (粵典–words.hk)
  1. Cantonese
    只狗忽然间乱咁吠。
    隻狗忽然間亂咁吠。
    zek3 gau2 fat1 jin4 gaan1 lyun2 gam3 fai6.
    • The dog barks suddenly.
  2. Cantonese
    我忽然间觉得好冻,系咪开大咗个冷气?
    我忽然間覺得好凍,係咪開大咗個冷氣?
    ngo5 fat1 jin4 gaan1 gok3 dak1 hou2 dung3, hai6 mai6 hoi1 daai6 zo2 go3 laang5 hei3.
    • I feel cold suddenly, xxxxxxxxxxx
  3. Cantonese
    忽然间行雷吓到我成个扎起。
    忽然間行雷嚇到我成個扎起。
    fat1 jin4 gaan1 haang4 leoi4 haak3 dou3 ngo5 seng4 go3 zaat6 hei2.
    • The sudden thunder scared my whole body to bump up.
  4. Cantonese
    忽然间落大雨,搞到我揦手唔成势。
    忽然間落大雨,搞到我揦手唔成勢。
    fat1 jin4 gaan1 lok6 daai6 jyu5, gaau2 dou3 ngo5 laa2 sau2 m4 sing4 sai3.
    • It suddenly rains, makes me so unprepared to handle.
  5. Cantonese
    呢段路忽然间由80咪限速收到50,好多司机一唔留神就俾人影快相。
    呢段路忽然間由80咪限速收到50,好多司機一唔留神就俾人影快相。
    ni1 dyun6 lou6 fat1 jin4 gaan1 jau4 baat3 sap6 mai1 haan6 cuk1 sau1 dou3 ng5 sap6, hou2 do1 si1 gei1 jat1 m4 lau4 san4 zau6 bei2 jan4 jing2 faai3 soeng2.
    • On this section of the road, the speed limit lowers sharply from 80 to 50km/h. Many drivers carelessly get speeding photos taken by the roadside speeding detector.