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Jyutping gwaat3 cou1 lung2
Pinyin guā cū lóng

Definitions (粵典–words.hk)
  1. 動詞、俚語
    用​唔​正​當​嘅​手段​賺​一大​筆錢
    to make a lot of money in an illegal or dishonest way; literally: to scrape thick dragon
  2. 近義詞
    刮龍
Definitions (Kaifangcidian)
  1. 剝刮大筆錢財 – 剥刮大笔钱财

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Jyutping gwaat3 cou1 lung4
Pinyin guā cū lóng

Definitions (CC-CANTO)
  1. earning huge amount of wealth illegally (slang)