Sentence:  Those who with nine months toil had spoil'd a Play,/ In hopes of Eating at a full Third day,/ Justly despairing longer to sustain/ A craving Stomach from an empty Brain,/ Have left Stage-Practice, chang'd their old Vocations,/ Atoning for bad Plays, with worse Translations,/ And like old "Sternhold" with laborious spite,/ Burlesque what nobler Muses better write:/ Thus while they for their Causes only seem/ To change the Channel, they corrupt the Stream./ So breaking "Vintners" to increase their Wine,/ With nauseous Drugs <WSD>debauch</WSD> the generous Vine:/ So barren "Gipsies" for recruit are said,/ With Strangers Issue to maintain the Trade;/ But lest the fair Bantling should be known,/ A daubing Walnut makes him all their own. 
Meaning of the word marked with <WSD> tags:  To debase (something); to lower the value of (something).