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Jyutping faat3 sai6 dong3 sik6 saang1 coi3
Pinyin fā shì dāng shí shēng cài

Definitions (粵典–words.hk)
  1. 語句
    輕易​、​隨便​許下​一​啲​承諾​,​貪口爽​而​冇​諗​住​實現
    to make easy promises without intention to keep them; literally: to swear an oath as if eating lettuce
    • 你信佢哋?班政棍一向慣咗發誓當食生菜㗎啦!
      你信佢哋?班政棍一向惯咗发誓当食生菜㗎啦!
      nei5 seon3 keoi5 dei6? baan1 zing3 gwan3 jat1 hoeng3 gwaan3 zo2 faat3 sai6 dong3 sik6 saang1 coi3 gaa3 laa1!
      You really trust them? Those politicians are used to making easy promises as if eating lettuce!
  2. 參看
    誓願當食生菜
Examples (粵典–words.hk)
  1. Cantonese
    你信佢哋?班政棍一向惯咗发誓当食生菜㗎啦!
    你信佢哋?班政棍一向慣咗發誓當食生菜㗎啦!
    nei5 seon3 keoi5 dei6? baan1 zing3 gwan3 jat1 hoeng3 gwaan3 zo2 faat3 sai6 dong3 sik6 saang1 coi3 gaa3 laa1!
    • You really trust them? Those politicians are used to making easy promises as if eating lettuce!
  2. Cantonese
    发誓当食生菜
    發誓當食生菜
    faat3 sai6 dong3 sik6 saang1 coi3
    • to make a promise without intending to keep it; to think of making an oath as eating lettuce