千せん載ざい一いち遇ぐう

noun which may take the genitive case particle 'no', noun

once-in-a-lifetime opportunity; golden opportunity; one-in-a-million chance

A yojijukugo emphasizing the extreme rarity of a favorable chance. Often used in formal or written contexts to describe a unique, fleeting opportunity.

• このプロジェクトに参さん加かできるのは千せん載ざい一いち遇ぐうのチャンスだ。

  Being able to join this project is a once-in-a-lifetime opportunity.

• 千せん載ざい一いち遇ぐうの好こう機きを逃のがさないように全ぜん力りょくを尽つくした。

  I gave it my all so as not to miss this golden opportunity.