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Jyutping baak3 diu2 sing4 coi4
Pinyin bǎi diǎo chéng cái

Definitions (粵典–words.hk)
  1. 語句、潮語、粗俗
    經過​其他人​多番​批評​同磨練​,​然後成​為​一個​有​能力​嘅​人
    becoming a better person through harsh criticism from others
  2. 參看
    百屌成材
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic, neologism, of a person, vulgar
    to improve after repeated criticism