鐵樹開花 [铁树开－]

Jyutping tit3 syu6 hoi1 faa1
Pinyin tiě shù kāi huā

Definitions (CC-CEDICT)
  1. lit. the iron tree blooms (idiom)
  2. a highly improbable or extremely rare occurrence
Definitions (Wiktionary)
  1. phrase, idiomatic
    extremely rare or hard to succeed
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）