Sentence:  Tyrian garbs, / Neptunian Albion's high teſtaceous food ["i.e.", oysters], / And flavour'd Chian wines with incenſe fum'd / To ſlake Patrician thirſt: for theſe, their rights / In the vile ſtreets they <WSD>proſtitute</WSD> to ſale; / Their ancient rights, their dignities, their laws, / Their native glorious freedom. 
Meaning of the word marked with <WSD> tags:  To exploit for base purposes; to whore.