“Venting your spleen” comes from the old belief that this organ held ill temper and melancholy. Dreaming of it is read as suppressed irritation or a low mood that needs an outlet.
Where in your waking life have you met something like this lately?
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.