society > travel > transport > transport or conveyance in a vehicle > vehicular traffic > [noun] > traffic control > clamp for illegally parked vehicle (3)
a kind of wheel clamp used to immobilize an illegally parked vehicle (apparently first used in Denver); cf. boot, n.3 6h.
In various technical uses. Short for Denver boot n. at Denver, n. U.S.
a clamp designed to be locked to one of the wheels of an illegally parked motor vehicle to immobilize it; hence as v. transitive.