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Jyutping cin1 zoi2 naan4 fung4
Pinyin qiān zǎi nán féng

Definitions (CC-CEDICT)
  1. extremely rare (idiom)
  2. once in a blue moon
Definitions (粵典–words.hk)
  1. 語句
    就算​喺​一千年​入面​,​都​未必​有​一次​,​比喻​非常​罕有
    extremely rare; once in a lifetime; literally: so rare that it might not appear in a thousand years
    • 一個千載難逢嘅機會
      一个千载难逢嘅机会
      jat1 go3 cin1 zoi2 naan4 fung4 ge3 gei1 wui6
      a once-in-a-lifetime opportunity
Definitions (Wiktionary)
  1. phrase, idiomatic
    once in a blue moon; not occurring once in a thousand years
    (syn.) 十年唔逢一闰, 十年唔逢一閏
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    你所要做的便是好好把握这千载难逢的机会。
    你所要做的便是好好把握這千載難逢的機會。
    nǐ suǒ yào zuò de biàn shì hǎo hǎo bǎ wò zhè qiān zǎi nán féng de jī huì 。
    • All you have to do is take advantage of this rare opportunity.
Examples (粵典–words.hk)
  1. Cantonese
    今次嘅超级狮子座流星雨系千载难逢嘅奇景。
    今次嘅超級獅子座流星雨係千載難逢嘅奇景。
    • This Leonid Meteor shower is extremely rare sight.
  2. Cantonese
    千载难逢
    千載難逢
    cin1 zoi2 naan4 fung4
    • occurring only once in thousand years; once in a blue moon
  3. Cantonese
    一个千载难逢嘅机会
    一個千載難逢嘅機會
    jat1 go3 cin1 zoi2 naan4 fung4 ge3 gei1 wui6
    • a once-in-a-lifetime opportunity