Knocking something over is read as clumsiness, haste or an upset you caused without meaning to. Dream books ask what fell, since it often mirrors what feels fragile.
Does the traditional reading fit your dream, or did it mean something else to you?
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.