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Jyutping bat1 hang6 zi1 hang6
Pinyin bù xìng zhī xìng

Definitions (CC-CEDICT)
  1. a fortune in misfortune
  2. a positive in the negative
Definitions (Wiktionary)
  1. phrase, idiomatic
    good fortune in the midst of bad; a stroke of good luck in a stretch of bad; redeeming feature in a piece of misfortune
    (syn.) 不幸中的大幸