A broken window is read as a shattered view or a boundary that has been breached. It can stand for vulnerability, or for a sudden, sharp change in how you see a situation.
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.