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Take inventory of the key elements of your story, particularly objects and places. Research those places and objects and look for title inspiration. For example, if your story centers on an emerald passed down through generations of the same family, you might research emeralds and find that they’ve traditionally been associated with faith and hope. So you might title your story something like “The Rock of Hope.” Look over the book titles on your own shelves and note down the titles that jump out at you.  Write down both the titles that jump out to you now and the books whose titles alone drew you in.  Review your list and try to determine what the successful titles have in common. For example, do they appeal to the senses, appeal to the reader’s imagination, etc? An allusion is a reference to or a phrase taken from an external source like another literary work, a song, or even something as commonplace as a brand or slogan.  Many authors have taken inspiration from classic works, including William Faulkner, whose Sound and the Fury is inspired by a line in Macbeth, and John Steinbeck, whose Grapes of Wrath is an allusion to a line in “The Battle Hymn of the Republic.”  Other authors have drawn inspiration from local vernacular sayings, like the London Cockney saying “queer as a clockwork orange” that inspired Anthony Burgess’s A Clockwork Orange. Still others have used allusions to popular culture, like Kurt Vonnegut, who used the Wheaties slogan for his book Breakfast of Champions.
Research. Check out your own bookshelves. Use an allusion.