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Jyutping hau6 toi4
Pinyin hòu tái

Definitions (Wiktionary)
  1. noun
    backstage
    (syn.) 鲎尾, 鱟尾
  2. noun
    background (type of activity on a computer that is not normally visible to the user)
    • 後臺運行
      后台运行
      hòu tái yùn xíng
      to run in the background
  3. noun, figuratively
    behind-the-scenes supporter
Examples (Wiktionary)
  1. Mandarin
    后台运行
    後臺運行
    hòu tái yùn xíng
    • to run in the background