百年不遇 [－－－－]

Jyutping baak3 nin4 bat1 jyu6
Pinyin bǎi nián bù yù

Definitions (CC-CEDICT)
  1. only met with once every hundred years (drought, flood etc)
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    once-in-a-hundred-years (event); not seen in a hundred years
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）