An elbow bends the arm and also pushes people aside, so it is read both as flexibility and as making room for yourself. Being elbowed in a dream is often tied to feeling crowded out.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.