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Jyutping kau5 zai2
Pinyin jiù zǎi

Definitions (粵典–words.hk)
  1. 名詞
    老婆​嘅​細​佬​(​量​詞​:​個​)
    brother-in-law; younger brother of one's wife
Definitions (Wiktionary)
  1. noun, Min-Bei, Min-Nan
    brother-in-law (wife's brother, especially her younger brother in Min Nan)
  2. noun, Cantonese
    brother-in-law (wife's younger brother)
Definitions (Kaifangcidian)
  1. 小舅子
  2. 內弟 – 内弟

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Jyutping kau3 zai2
Pinyin jiù zǎi

Definitions (粵典–words.hk)
  1. 名詞
    老婆​嘅​細​佬​(​量​詞​:​個​)
    brother-in-law; younger brother of one's wife

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Jyutping kau5 zai2
Pinyin jiù zǐ

Definitions (CC-CANTO)
  1. (noun) (relatives) wife's younger brother