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Jyutping zi6 tau4
Pinyin zì tóu

Definitions (Wiktionary)
  1. adv, Taiwanese-Hokkien, Xiamen, Zhangzhou
    from the start; from the beginning
    (syn.) 從頭, 从头
  2. verb, Hokkien, Quanzhou
    to start from oneself (used in mahjong or other games in rolling a die to decide who goes first)