The present participle of corduroy; making or constructing roads with logs laid perpendicular to the direction of travel, or covering something with corduroy material.
From corduroy, which as a verb means to construct with corduroy logs (a historic road-building technique). The -ing suffix creates the present participle form used in continuous actions.
Corduroy roads were pioneer solutions to muddy trails—settlers would lay logs side-by-side perpendicular to the road, creating a bumpy but passable surface that gave the fabric its name by resemblance, not the other way around.
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