Sentence:  Robinson told Policemen James Jones and Morgan Lloyd of the Wabash avenue district that 10 youths <WSD>boarded</WSD> his south bound express bus in front of Dunbar Vocational High school , 30 th street and South Park way , and began `` skylarking '' . 
Meaning of the word marked with <WSD> tags:  get on board of (trains, buses, ships, aircraft, etc.)