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Jyutping jat1 hei3 ho1 sing4
Pinyin yī qì hē chéng

Definitions (CC-CEDICT)
  1. to do something at one go
  2. to flow smoothly
Definitions (粵典–words.hk)
  1. 語句
    一次​過​完成​一件​事
    to get something done in one go; to carry something through without stopping
    • 佢請咗兩個月假,一氣呵成咁寫咗一本書。
      佢请咗两个月假,一气呵成咁写咗一本书。
      keoi5 ceng2 zo2 loeng5 go3 jyut6 gaa3, jat1 hei3 ho1 sing4 gam2 se2 zo2 jat1 bun2 syu1.
      He requested for a two-month leave, and wrote a book in one go.
  2. 近義詞
    一口氣
Definitions (Wiktionary)
  1. phrase, idiomatic, of writing, usually
    to flow smoothly and coherently
  2. phrase, idiomatic
    to do something in one go; to do something without stopping
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    佢请咗两个月假,一气呵成咁写咗一本书。
    佢請咗兩個月假,一氣呵成咁寫咗一本書。
    keoi5 ceng2 zo2 loeng5 go3 jyut6 gaa3, jat1 hei3 ho1 sing4 gam2 se2 zo2 jat1 bun2 syu1.
    • He requested for a two-month leave, and wrote a book in one go.