IdiomBody & SensesFrench

Avoir le compas dans l'œil

Meaning: Having excellent judgment of distance, measurement, or proportion.

Literally: To have a compass in the eye

Example: “Pas besoin de mètre, mon grand-père a le compas dans l'œil.” — No need for a tape measure; my grandfather can measure things by eye.

Origin: Saint-Simon has it in his Mémoires in the 18th century, writing about Louis XIV's own eye for measurement, though the phrase is sometimes attributed instead to Michelangelo, and no source manages to settle which claim, if either, is the real first use. Compas — a compass, in the drafting sense, for measuring angles and distances — comes from Latin compassus. The same root also produced the verb compasser, to measure out with one's own pace, which is why French has a small family of expressions tying the compas to legs and walking as much as to the eye — all variations on judging distance without an instrument in hand.

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