Sentence:  With a little manœuvring they contrived to meet on the doorstep which was […] in a boiling stream of passers-by, hurrying <WSD>business</WSD> people speeding past in a flurry of fumes and dust in the bright haze. 
Meaning of the word marked with <WSD> tags:  Of, to, pertaining to or utilized for purposes of conducting trade, commerce, governance, advocacy or other professional purposes.