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Jyutping bik1
Pinyin bèi

Definitions (Unihan)
  1. to strop, to sharpen by rubbing against leather, stone, etc.
  2. Cangjie Input
    SJC

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Jyutping bei3
Pinyin bèi

Definitions (CC-CEDICT)
  1. to sharpen (a knife) on a stone or a strop
Definitions (CC-CANTO)
  1. to sharpen
Definitions (Wiktionary)
  1. character
    to sharpen (a knife by repeated grinding)