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Jyutping sai6 san4 pek3 jyun6
Pinyin shì shén pī yuàn

Definitions (CC-CANTO)
  1. to swear a solemn oath
Definitions (粵典–words.hk)
  1. 語句
    下定​決心​,​好​堅定​咁​聲稱​或者​強調
    to be determined and to claim or stress firmly; literally: to swear to a god and make a pledge