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Jyutping seon3 sai6
Pinyin xìn shì

Definitions (Wiktionary)
  1. noun
    faithful oath; faithful pledge
Examples (粵典–words.hk)
  1. Cantonese
    信誓
    信誓
    • promise
  2. Cantonese
    好多人结婚前都信誓旦旦咁,但结婚后就咩都冇做过。
    好多人結婚前都信誓旦旦咁,但結婚後就咩都冇做過。
    hou2 do1 jan4 git3 fan1 cin4 dou1 seon3 sai6 daan3 daan3 gam2, daan6 git3 fan1 hau6 zau6 me1 dou1 mou5 zou6 gwo3.
    • Many people make a solemn vow before getting married but do nothing afterwards.