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 , <WSD>drink</WSD> arak , play dice , and dance . 
Meaning of the word marked with <WSD> tags:  take in liquids