once in a lifetime

Meaning: So rare that it will probably happen only once.

Language: English

Literally: (Already vivid in English)

Example: “Seeing the eclipse from the mountain was once in a lifetime.”

Category: Daily Life

Origin: A plain measure of rarity, common from the 19th century; "once-in-a-lifetime chance" is a frequent pairing.

Equivalents in other languages

More idioms — Daily Life

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