once in a lifetime

1. Extremely rare, especially as an opportunity. For example, An offer like that will come just once in a lifetime. This phrase, often used hyperbolically, was first recorded in 1854. Also see of one's life.

Example Sentences

He said: "This is a once in a lifetime opportunity to actually start that reform that policing needs, and it will be a missed opportunity if it's not properly funded from the start."

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The proposed legislation was a "once in a lifetime opportunity" for the government to "shift the dial just slightly in favour of working people", she said.

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"A job like this is really once in a lifetime, so just go for it."

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It is a test to be taken once in a lifetime and will be overseen by member federations.

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Mr and Ms Foreman were arrested by Iranian authorities in January while on a "once in a lifetime" trip around the world.

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Related Words

• unbelievable