The lemon is read as sharpness, cleansing and a bitter truth. Dream books link it to disappointment or sour feelings, and also to freshness and a clear head. Squeezing a lemon is usually read as making the best of a hard situation. Eating one is linked to accepting something unpleasant, while a lemon tree in bloom points to hope and renewal. Lemonade stands for turning sourness into something good. It can help to ask what has felt sour lately and what might refresh it.
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.