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Jyutping baak3 mou5
Pinyin bó mǔ

Definitions (Wiktionary)
  1. noun, Taiwanese-Hokkien
    paternal uncle and his wife (father's elder brother and his wife)
  2. noun, Hakka, Taiwanese-Hokkien
    paternal aunt (wife of father's elder brother)
  3. noun, Hakka
    Term of address to the mother of one's friend or colleague.