Sentence:  Gratiano: / O, be thou damn'd, inexecrable dog! / And for thy life let justice be accused. / Thou almost makest me waver in my faith, / To hold opinion with Pythagoras, / That souls of animals infuse themselves / Into the trunks of men: thy currish spirit / Govern'd a wolf, who, hang'd for human slaughter, / Even from the gallows did his fell soul <WSD>fleet</WSD>, / And, whilst thou lay'st in thy unhallow'd dam, / Infused itself in thee; for thy desires / Are wolfish, bloody, starved, and ravenous. 
Meaning of the word marked with <WSD> tags:  To flee, to escape, to speed away.