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Jyutping zi1 si6 tai2 daai6
Pinyin zī shì tǐ dà

Definitions (CC-CEDICT)
  1. this is no small thing (idiom)
  2. to have a serious matter at hand
Definitions (粵典–words.hk)
  1. 語句
    呢​件​事​好​重大
    This is a serious matter.
    • 茲事體大,小心為上。
      兹事体大,小心为上。
      zi1 si6 tai2 daai6, siu2 sam1 wai4 soeng6.
      This is of high importance. Take it seriously.
Examples (粵典–words.hk)
  1. Cantonese
    兹事体大,小心为上。
    茲事體大,小心為上。
    zi1 si6 tai2 daai6, siu2 sam1 wai4 soeng6.
    • This is of high importance. Take it seriously.
  2. Cantonese
    兹事体大
    茲事體大
    zi1 si6 tai2 daai6
    • This is a serious matter.