once-in-a-lifetimeadjective [ before noun ]uk /ˌwʌn.sɪnəˈlaɪf.taɪm/ us /ˌwʌn.sɪnəˈlaɪf.taɪm/
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(Definition of “once-in-a-lifetime” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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