1) Exclusively Saxon word 2) Exclusively Anglo word 3) Muscular disorder 4) Word with Anglo-Saxon origins 5) Word of purely Anglo origin 
A charley horse is a popular colloquial term in Canada and the United States of America for painful spasms or cramps in the leg muscles, typically lasting anywhere from a few seconds to about a day. It can also refer to a bruise on an arm or leg and a bruising of the quadriceps muscle of the anterior or lateral thigh, or contusion of the femur, th...
A contusion or bruise to any muscle resulting in intramuscular bleeding. No other injury should be called a charley horse.
Localised pain or muscle stiffness following a contusion of a muscle. ... Origin: slang ... (05 Mar 2000) ... 
(chahr´le hors) popular term for soreness and stiffness in a muscle, especially the quadriceps femoris muscles, due to overstrain or contusion.
Type: Term Pronunciation: char′lē hōrs Definitions: 1. Localized pain or muscle stiffness following a contusion of a muscle.
Charley horse: A cramp in a muscle in the leg, usually caused by a strain or injury. A charley horse can last anywhere from a few seconds to a quarter of an hour, and occasionally longer. It is not uncommon for one to recur repeatedly before it finally goes away. The term 'charley horse' is generally believed to be American baseball slang. One stor...
Charley horse is American slang for stiffness or cramp in the arm or leg.
charley-horse noun a muscular cramp (especially in the thigh or calf) following vigorous exercise
a painful, involuntary cramp of an arm or leg muscle resulting from excessive muscular strain or a blow.