Sentence:  "First Servant:" O, I am slain! My lord, you have one eye left / To see some mischief on him. O! "[Dies." / "Cornwall:" Lest it see more, prevent it. Out, vile jelly! / Where is thy <WSD>lustre</WSD> now? / "Gloucester:" All dark and comfortless. 
Meaning of the word marked with <WSD> tags:  Shine, polish or sparkle.