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Jyutping baak3 jat6 sau3
Pinyin bǎi rì sòu

Definitions (Wiktionary)
  1. noun, Hakka, Min-Nan
    pertussis; whooping cough
    (syn.) 百日痚 GT, GT - General Taiwaneseno particular region identified), 百日嗽, 百日咳, 連珠嗽