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Jyutping zeon2 cuk1
Pinyin jìn sù

Definitions (Wiktionary)
  1. adv
    as quickly as possible
    (syn.) 尽快, 儘快

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Jyutping zeon6 cuk1
Pinyin jìn sù

Definitions (粵典–words.hk)
  1. 動詞
    用​最快​嘅​速度​去​做​一樣​野
    to do something as soon as possible