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Jyutping seon3 sai6 daan3 daan3
Pinyin xìn shì dàn dàn

Definitions (CC-CEDICT)
  1. to make a solemn vow
Definitions (粵典–words.hk)
  1. 語句
    誓言​講到​好​真實​可信​咁
    to make a solemn vow
    • 好多人結婚前都信誓旦旦咁,但結婚後就咩都冇做過。
      好多人结婚前都信誓旦旦咁,但结婚后就咩都冇做过。
      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.
Definitions (Wiktionary)
  1. phrase, idiomatic
    pledging in all sincerity; vowing solemnly
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. 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.