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Jyutping jat1 kwan3 sau2
Pinyin yī kùn shǒu

Definitions (Wiktionary)
  1. adv, Hokkien, Quanzhou, Xiamen
    in one breath; without a break; in one go
    (syn.) 一口气, 一睏仔, 一困仔, 一氣頭, 一气头, 一口氣