IdiomDaily LifeFrench

Être une lumière

Meaning: To be highly intelligent — used almost exclusively in the negative.

Literally: To be a light

Example: “Son cousin est gentil, mais ce n'est pas une lumière.” — His cousin is nice, but he's not the sharpest tool in the shed.

English equivalent: Not the sharpest tool in the shed

Equivalents in other languages

Origin: Light for understanding is old and ordinary, as in the Enlightenment's own Lumières (the Lights). What is distinctive is that French now says it almost only as ce n'est pas une lumière.

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