Dreams dictionary: Quicksand
Dreams dictionary: Interpretation 1
To dream that you are sinking in quicksand indicates feelings of insecurity. You have misjudged the solid foundation that you are on. Perhaps you have mistakenly gotten too comfortable in some situation. You need to pay attention to what you are doing and where you are going. Alternatively, the dream is analogous to regressing into your subconscious.
Dreams dictionary: Miller Dream Interpretation
To find yourself in quicksand while dreaming, you will meet with loss and deceit. If you are unable to overcome it, you will be involved in overwhelming misfortunes. For a young woman to be rescued by her lover from quicksand, she will possess a worthy and faithful husband, who will still remain her lover.