Denver boot

a large metal clamp locked to a wheel of a motor vehicle by the police to immobilize the vehicle: used primarily to force people to pay their parking tickets

Origin: after Denver

See Denver boot in American Heritage Dictionary 4

noun
A device locked to the wheel of a parked vehicle to keep it from being driven, used especially to force settlement of outstanding traffic violations.

Origin:

Origin: After Denver, one of the first cities to use it

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Denver boot

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