negligent entrustment n: the entrusting of a dangerous article (as a motor vehicle) to one who is reckless or too inexperienced or incompetent to use it safely
: a theory or doctrine making one liable for injury caused by a party to whom one negligently entrusted something
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.