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once in a lifetime
01
estremamente raro
used for referring to a very special opportunity that most likely will not be offered more than once to someone
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
unico nella vita, occasione irripetibile
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.
Avere la possibilità di partecipare alle Olimpiadi di persona è un'occasione irripetibile per la maggior parte delle persone.
Being part of the Commonwealth Games has been a once in a lifetime experience.
Essere parte dei Giochi del Commonwealth è stata un'esperienza unica nella vita, occasione irripetibile.