Sentence:  At any other school you would be playing varsity, and Wallace has you pigeon-holed on the <WSD>subs</WSD>." "Maybe he has his reasons," Jim replied. "And he hasn't pigeon-holed me on the <WSD>subs</WSD> yet — not this season. 
Meaning of the word marked with <WSD> tags:  A substitute, often in sports.