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Jyutping naai5 zik1 zik1
Pinyin nǎi jī jī

Definitions (Wiktionary)
  1. noun, Xiang, childish
    milk; breast milk
    (syn.) 乳汁, 乳, 奶汁, 奶子, 奶奶, 奶, 唧唧, 奶水