IdiomNatureFrench

Blanchir sous le harnais

Meaning: To grow old in a profession.

Literally: To grow white under the harness

Example: “Ce commissaire a blanchi sous le harnais ; plus rien ne le surprend.” — This police chief is an old hand; nothing surprises him anymore.

English equivalent: An old hand

Other ways to say this

Origin: The harnais is armor rather than horse tack, so the figure is of a soldier whose hair has gone gray inside it. It implies long service and, usually, that it went unrewarded.

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