Sentence:  Think of the insults, wrongs, and contumelies,/ Ye bear from your proud lords—that your hard toil/ Manures their fertile fields—you plow the earth,/ You sow the corn, you reap the ripen'd harvest,—/ They <WSD>riot</WSD> on the produce! 
Meaning of the word marked with <WSD> tags:  To act in an unrestrained or wanton manner; to indulge in excess of luxury, feasting, etc.