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Jyutping bat1 zi1 so2 ji5
Pinyin bù zhī suǒ yǐ

Definitions (CC-CEDICT)
  1. to not know the reason
  2. to not know what to do
Definitions (CC-CANTO)
  1. Not knowing the reason why
Definitions (Wiktionary)
  1. phrase, idiomatic
    to now know why it is so; to not know the reason
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)