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Jyutping sai3 gaai3 zai2
Pinyin shì jiè zǎi

Definitions (粵典–words.hk)
  1. 名詞
    好識​做人​,​面面​俱​圓​嘅​人​。​帶​貶義​。
    (derogatory) someone who knows how to get on the world; someone who is an experienced and effective operator in a particular sphere; a "smooth operator"; a "slick character"; literally "worldly boy"
    • 佢係世界仔嚟嘅,唔使戥佢擔心。
      佢系世界仔嚟嘅,唔使戥佢担心。
      keoi5 hai6 sai3 gaai3 zai2 lai4 ge2, m4 sai2 dang6 keoi5 daam1 sam1.
      He is worldly-wise. We don't have to worry about him.
Definitions (Wiktionary)
  1. noun, Cantonese
    one who is smooth and slick in social relations

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Jyutping sai3 gaai3 zai2
Pinyin shì jiè zǐ

Definitions (CC-CANTO)
  1. (noun) a guy who is skillful and good at socializing; a man of the world, usually pejorative.
Examples (粵典–words.hk)
  1. Cantonese
    佢系世界仔嚟嘅,唔使戥佢担心。
    佢係世界仔嚟嘅,唔使戥佢擔心。
    keoi5 hai6 sai3 gaai3 zai2 lai4 ge2, m4 sai2 dang6 keoi5 daam1 sam1.
    • He is worldly-wise. We don't have to worry about him.