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Jyutping biu2 aa3 sou2
Pinyin biǎo ā sǎo

Definitions (Wiktionary)
  1. noun, Wu
    cousin-in-law; cousin's wife (wife of mother's sibling's or father's sister's son older than oneself)
    (syn.) 表兄嫂, 阿嫂 face-to-face, 阿嫂 dated, 表嫂嫂, 表嫂, 表阿嫂