In the title of Raymond Chandler's 1939 novel, 'The Big Sleep' is a (hard-boiled) euphemism for death. If someone is sleeping the big sleep then they are dead.
Hello. :) I suggest that you are asking why novels have titles and what they do to help? That seem to be the question to be. So, titles stop people from going round a library/bookshop and opening...
lord of the flies = what else is there to be lord of? remember simon's encounter with the ig's head on a stick? the lord of the flies symbolizes the evil in us..