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Jyutping pui1 zi2
Pinyin pēi zi

Definitions (Wiktionary)
  1. noun
    unburnt pottery
  2. noun, figuratively
    unfinished product

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Jyutping pui1 zi2
Pinyin pī zi

Definitions (CC-CEDICT)
  1. base
  2. semifinished product
  3. (fig.) the makings of (a talented actor etc)