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
예시들
They witnessed a sight that happens only once in a lifetime.
once-in-a-lifetime
01
일생에 한 번뿐인, 특별한
extremely rare or unique and is not likely to be repeated or experienced again in one's lifetime
예시들
Seeing the Grand Canyon was a once-in-a-lifetime experience that I will never forget.
그랜드 캐니언을 보는 것은 제가 결코 잊지 못할 일생일대의 경험이었습니다.
