“Well, suppose we take a plunge in the swimming-pool? I haven’t made use of it all summer.”
Not only is this an instance of foreshadowing Gatsby’s death, but it is another piece of information that proves that Gatsby’s wealth is purely for show. He isn’t really even taking full advantage of his wealth; his wealth isn’t for him, it is for Daisy.
To help improve the meaning of these lyrics, visit “The Great Gatsby (Chapter V)” by F. Scott Fitzgerald and leave a comment on the lyrics box