A<unk>  is a painful involuntary cramp in the legs and/or foot, lasting anywhere from a few seconds to a day. The term formerly referred more commonly to bruising of the quadriceps muscle of the anterior or lateral thigh, or contusion of the femur, that commonly results in a haematoma and sometimes several weeks of pain and disability. In this latter sense, such an injury is known as dead leg. Dead legs and<unk> s are two different types of injuries: A<unk>  involves the muscles contracting without warning, and can last from a few seconds to a few days. A dead leg often occurs in contact sports, such as football when an athlete suffers a knee (blunt trauma) to the lateral quadriceps causing a haematoma or temporary paresis and antalgic gait as a result of pain. Colloquially, taking a hit in the thigh area (thigh contusion) can also be referred to as a<unk>  or even simply a<unk> .
Charley horse
Hairball
Crutch
Wellbee
Greenpilot
Cowlick
Squawk 
White cane