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Jyutping zung1 san1 daai6 si6
Pinyin zhōng shēn dà shì

Definitions (CC-CEDICT)
  1. major turning point of lifelong import (esp. marriage)
Definitions (粵典–words.hk)
  1. 名詞
    通常​一生​人​只會​做​一次​,​而且​會​直接​影響​之​後​嘅​人生
    (usually) once-in-a-lifetime event; important event in one's life, often refers to marriage, which affects one's whole life
    • 結婚係終身大事,點可以咁草率 㗎?
      结婚系终身大事,点可以咁草率 㗎?
      git3 fan1 hai6 zung1 san1 daai6 si6, dim2 ho2 ji5 gam3 cou2 seot1 gaa3?
      Marriage is a once-in-a-lifetime thing, how can we do it hastily and thoughtlessly?
Definitions (Wiktionary)
  1. phrase, idiomatic
    big event in one's life (usually referring to marriage)
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    终身大事
    終身大事
    zung1 san1 daai6 si6
    • big event in one's life (usually referring to marriage)
  2. Cantonese
    结婚系终身大事,点可以咁草率 㗎?
    結婚係終身大事,點可以咁草率 㗎?
    git3 fan1 hai6 zung1 san1 daai6 si6, dim2 ho2 ji5 gam3 cou2 seot1 gaa3?
    • Marriage is a once-in-a-lifetime thing, how can we do it hastily and thoughtlessly?