Read the passage given below and answer the question I designed, after my first voyage, to spend the rest of my days at Baghdad, but it was not long ere I grew weary of an indolent life and I put to sea a second time with merchants of known probity. We embarked on board of a good ship and set sail. One day we landed on an island covered with several sorts of fruit trees, but we could see neither man nor animal. While some diverted themselves with gathering flowers, and other fruits, I took my wine and provisions and sat down near a stream betwixt two high trees, which afforded a delightful shade. I made a good meal and afterwards fell asleep. When I woke up, the ship was no longer in view. In this sad condition, I was ready to die with grief. When I gazed towards the sea, I could discern nothing but sky and water, but looking over the land I beheld something white, and coming down, I took what provision I had left and went towards the object which was so distant that at first could not distinguish what it was. As I approached, I thought it to be a white dome of a prodigious height and extent. I drew near to it, and walked round it and found no door to it. I found that I had not strength nor activity to climb it on account of its exceeding smoothness. I went round the dome measuring its circumference. I meditated upon some means of gaining an entrance into it but no means of accomplishing this occurred to me. By this time the sun was about to set, and all of a sudden the sky became as dark as if it had been covered with a thick cloud. I was much astonished at this sudden darkness but much more when I found it occasioned by a bird of a most extraordinary size that came flying towards me. I remembered that I had often heard mariners speak of a miraculous bird called the roc, and conceived that the great dome which I so much admired must be her egg. Shortly afterwards the bird alighted and sat over the egg. Identify the Part of Speech of the underlined word in the expression : '.... to die with grief.'