immurement

Immurement (from Latin im- "in" and murus "wall"; literally "walling in") is a form of imprisonment, usually for life, in which a person is, for example, locked within an enclosed space and all possible exits turned into impassable walls. This includes instances where people have been enclosed in extremely tight confinement, such as within a coffin. When used as a means of execution, the prisoner is simply left to die from starvation or dehydration. This is distinct from being buried alive, in which the victim typically dies of asphyxiation.