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Jyutping sap6 nin4 m4 fung4 jat1 jeon6
Pinyin shí nián wú féng yī rùn

Definitions (CC-CANTO)
  1. once in a blue moon [colloquial]
Definitions (粵典–words.hk)
  1. 語句
    形容​某個​情景​非常​罕見​、​好​少有​,​正如​好少​可​十年​都​冇​落過​雨
    very rare occurrence; once in a blue moon; as if there were not have any rainfall in ten years
    • 佢請食飯呀?十年唔逢一潤喎。
      佢请食饭呀?十年唔逢一润㖞。
      keoi5 ceng2 sik6 faan6 aa4? sap6 nin4 m4 fung4 jat1 jeon6 wo3.
      He treated (someone) a meal? It is once in a blue moon.
Examples (粵典–words.hk)
  1. Cantonese
    佢请食饭呀?十年唔逢一润㖞。
    佢請食飯呀?十年唔逢一潤喎。
    keoi5 ceng2 sik6 faan6 aa4? sap6 nin4 m4 fung4 jat1 jeon6 wo3.
    • He treated (someone) a meal? It is once in a blue moon.