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Region: General | Usage example: This concert is a once-in-a-lifetime event.

Once in a lifetime

Meaning

Extremely rare or unique.

Usage

Used to emphasize uniqueness.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Simple expression of singular opportunity.

Used in promotional language since the 20th century.

Related Idioms

Once in a blue moon

Very rarely.

Measure twice, cut once

Double-check before taking irreversible action.

Once bitten, twice shy

Hesitant to try again after a bad experience.

More Idioms

Break the ice

To do or say something to relieve tension or get conversation going in a social situation.

Cut to the chase

Skip ahead to the most important or exciting part of something.

The ball is in your court

It is now your turn to take action or make a decision.

Throw in the towel

To concede defeat or admit a struggle isn't worth continuing.