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Jyutping wu1 jau4 jau4
Pinyin wū yóu yóu

Definitions (Wiktionary)
  1. adj, ideophonic
    jet-black; shiny black; glossy black
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Wiktionary)
  1. Mandarin
    乌油油
    烏油油
    wū yóu yóu
    • glossy black