Sentence:  Gordon Biggs, on his way to biology, his favorite class, turns a corner and is immediately seized and stunned by a <WSD>deadleg</WSD> to the thigh, (judicious application of the knee to the fleshy part of the upper leg, resulting in prolonged numbness, hence the term 'deadleg'). 
Meaning of the word marked with <WSD> tags:  (dead leg) (injury to the upper thigh)