“Once-in-a-lifetime” in Japanese
Short answer
Once-in-a-lifetime in Japanese is “千載一遇” (senzaiichiguu). Full meaning: once-in-a-lifetime (opportunity), golden (opportunity), one-in-a-million (chance).
Other ways to say “Once-in-a-lifetime” in Japanese
一世一代
isseichidai once in a lifetime, the first and last occurrence (event, experience) of one's lifetime
一生に一度
isshouniichido once in a lifetime, once in one's life
一生一度
isshouichido once in one's life, once in a lifetime
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