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Jyutping si5 zeng2 zi1 tou4
Pinyin shì jǐng zhī tú

Definitions (Wiktionary)
  1. phrase, derogatory, idiomatic
    vulgar and unscrupulous person in a city; hooligan
Examples (粵典–words.hk)
  1. Cantonese
    市井之徒
    市井之徒
    si5 zeng2 zi1 tou4
    • the uneducated; the lower classes of the society