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Jyutping gik6 cuk1
Pinyin jí sù

Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. adv
    extremely quickly
  2. noun
    extreme speed
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    车子极速飙过。
    車子極速飆過。
    chē zi jí sù biāo guò 。
    • A car went by at terrific speed.
Examples (粵典–words.hk)
  1. Cantonese
    佢一上车就极速劈落旺角。
    佢一上車就極速劈落旺角。
    keoi5 jat1 soeng5 ce1 zau6 gik6 cuk1 pek3 lok6 wong6 gok3.
    • He sped through to Mong Kok once he got into his car.