An office chair stands for your role at work and your sense of position. Spinning in one is read as restlessness, and a broken one as doubt about where you stand professionally.
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.