Sentence:  In hopes the coming Scenes your Mirth will raise / To you, the Iust pretenders to the Bays; / The Poet humbly thus a Reverence pays / And you, the Contraries, that hate the Pains / Of Labour'd Sense, or of Improving Brains: / That feel the Lashes in a well-writ Play, / He bids <WSD>perk up</WSD> and smile, the Satyr sleeps to Day. 
Meaning of the word marked with <WSD> tags:  to become more lively or enthusiastic.