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Jyutping jat1 hei3 tau4
Pinyin yī qì tóu

Definitions (Wiktionary)
  1. adv, Teochew
    in one breath; without a break; in one go
    (syn.) 一口气, 一睏手, 一睏仔, 一困手, 一困仔, 一口氣