A backbone in a dream represents support and stability.
If you dream that you have a prominent backbone, or spine, you feel capable of supporting yourself through a difficult time or you have been supporting someone else.
A dream that someone else has a very noticeable backbone means that you need the support of others.
A broken backbone in a dream represents of a lack of support. If you dream that your own backbone aches or is broken, you feel that you have been supporting others for too long.
If you dream about a backbone, it may be a sign that you are being too rigid and need to be more flexible in your beliefs or in your actions.