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once in a lifetime
01
used for referring to a very special opportunity that most likely will not be offered more than once to someone
Idiom
Example
They experience moments that happen only once in a lifetime.
He feels that this chance only comes once in a lifetime.
once-in-a-lifetime
01
一生に一度の, 稀な
extremely rare or unique and is not likely to be repeated or experienced again in one's lifetime
Example
Being able to attend the Olympics in person is a once-in-a-lifetime opportunity for most people.
オリンピックに直接参加できることは、ほとんどの人にとって一生に一度の稀な機会です。
Being part of the Commonwealth Games has been a once in a lifetime experience.
コモンウェルスゲームの一員であることは、一生に一度の、稀な体験でした。
