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Jyutping mok6 bat1 si6
Pinyin mò bù shì

Definitions (CC-CEDICT)
  1. probably
  2. perhaps
  3. could it be that...?
Definitions (Wiktionary)
  1. adv
    can it be that; is it possible that
    (syn.) 難道, 冇過, 甭, 莫非, 毋成, 毋旨估, 難不成, 唔得旨, 無敢, 敢是, 豈, 莫不是, 敢講, 無成, 攏無, 毋旨, 總無, 敢會, 唔成, 敢係, 未是, 敢, 唔通
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)