Sentence:  It was April 22, 1831, and a young man was walking <WSD>down</WSD> Whitehall in the direction of Parliament Street. He wore shepherd's plaid trousers and the swallow-tail coat of the day, with a figured muslin cravat wound about his wide-spread collar. 
Meaning of the word marked with <WSD> tags:  At a lower or further place or position along a set path.