Sentence:  Saxton has made only one second-half appearance this season and that was in the Washington State game , for four plays : he returned the kickoff 30 yards , gained five yards through the line and then uncorked a 56 - <WSD>yard</WSD> touchdown run before retiring to the bench . 
Meaning of the word marked with <WSD> tags:  a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride