What does it mean to dream about tombstone?
A tombstone in a dream often marks something you regard as finished, or a wish to remember it, rather than a sign about anyone's death.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read a tombstone as a marker the mind sets over a buried feeling or memory, naming what has been put away. A name read on the stone can point to a tangled wish about that person. He would ask whose name the dreamer expected to see.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung might see a tombstone as the place where an old part of the self is laid to rest and remembered. The words carved on it can hint at how the dreamer sums up that ending. It marks both a close and a thing kept in memory.
Jungian concept (our summary).Modern
Under the continuity view, tombstone dreams often follow grief, a visit to a grave, or thoughts about time and being remembered. The mind keeps working on endings and legacy. The feeling in the dream usually points to which is at work.
Continuity hypothesis (our summary).Mythological
Many traditions raised stones over the dead to fix their memory in the land and to honour their passage. The carved name and words were a way of keeping a life from being forgotten. The marker stood at the border between the living and the dead.
Rosmerta Publishing editorial synthesis (after Bulfinch; Brewer).