Sentence:  It is the gait of the human who must run to live : arms dangling , legs barely swinging over the ground , head hung down and only occasionally swinging up to <WSD>see</WSD> the target , a loose motion that is just short of stumbling and yet is wonderfully graceful . 
Meaning of the word marked with <WSD> tags:  perceive by sight or have the power to perceive by sight