Sentence:  Avaunt, caitiff, dost thou <WSD>"thou</WSD>" me! / I am come of good kin, I tell thee! / My mother was a lady of the stews' blood born, / And (knight of the halter) my father ware an horn; / Therefore I take it in full great scorn, / That thou shouldest thus check me. 
Meaning of the word marked with <WSD> tags:  To address (a person) using the pronoun "thou", especially as an expression of contempt or familiarity.