A burial is read as putting something to rest — a memory, a conflict or a part of your past. Burying an object in a dream can also mean hiding something you are not ready to face.
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.