Sentence:  Above , in the tiled prosceniums of the alcoves , boys sing the ghazals of Hafiz and Saadi , while at the very bottom , in the vaults , the toughs and blades of the city hoot and bang their drums , drink arak , play dice , and <WSD>dance</WSD> . 
Meaning of the word marked with <WSD> tags:  move in a graceful and rhythmical way