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Jyutping hot3 zi1
Pinyin hé zhī

Definitions (Wiktionary)
  1. adv, Taiwanese-Hokkien
    who would have thought; little did one know; how was one to know
  2. phrase, Taiwanese-Hokkien, rhetoric
    how would [someone] know; [someone] doesn't know
    (syn.) 点知, 誰料, 谁料, 哪知, 點知, 怎知