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Jyutping jat1 kyut3 bat1 zan3
Pinyin yī jué bù zhèn

Definitions (CC-CEDICT)
  1. one stumble, unable to rise (idiom); a setback leading to total collapse
  2. ruined at a stroke
  3. unable to recover after a minor hitch
Definitions (粵典–words.hk)
  1. 動詞
    字面​解即​係​一​跌倒​就​起​唔​返身​。​引伸​做​遇到​一次​挫折​之​後​就​唔​振作​、​唔​興旺​、​頹廢​。
    Become devastated and slump after experiencing a setback.(Literally, it means once a fall, somebody could not pick back up.)
    • 自從個神射手轉會之後,成隊波就一蹶不振,成年都無拎過冠軍。
      自从个神射手转会之后,成队波就一蹶不振,成年都无拎过冠军。
      zi6 cung4 go3 san4 se6 sau2 zyun2 wui6,sing4 deoi6 bo1 zau6 jat1 kyut3 bat1 zan3, sing4 nin4 dou1 mou4 ling1 gwo3 gun3 gwan1
      Once the top scorer transferred to another football club, the whole team was devastated and they did not get any champion in the whole year.
  2. 近義詞
    不振、萎靡不振
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    the subject flipped over after wobbling
  2. phrase, idiomatic
    one tumbles and unable to speak at all
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    自从个神射手转会之后,成队波就一蹶不振,成年都无拎过冠军。
    自從個神射手轉會之後,成隊波就一蹶不振,成年都無拎過冠軍。
    zi6 cung4 go3 san4 se6 sau2 zyun2 wui6,sing4 deoi6 bo1 zau6 jat1 kyut3 bat1 zan3, sing4 nin4 dou1 mou4 ling1 gwo3 gun3 gwan1
    • Once the top scorer transferred to another football club, the whole team was devastated and they did not get any champion in the whole year.