That which supports life. By turning your back on someone, you are stopping yourself from supporting their life choices. Support can be several things: money, backing someone up financially, relationships, putting your back up against a wall and having nowhere else to go. The back is a part of your survival. Without a healthy back you do not have enough strength to do much, and so you get held back or need to be carried by someone else. You lose your independence. In a dream, it is important to look at the back. Is it bent, straight, healthy, strong, or weak? How are you channelling your personal power, mentally, spiritually, emotionally, or physically in your life? Are you fearless, or spineless when it comes to life decisions?
See Chiropractor, Spine, Backpack, Strength, Balance, Blocked, Freedom, Muscle, Pain, Standing.