Immure: to confine within walls.
I first encountered the word “mur” at the site of Jeanne d’Arc’s death. This is a perfect example of a perfect English word, and I love when they are made like this. A word that says what it means. The beauty is that it takes a word from the French and gives it extra meaning for which we don’t really have a common word, which can then be extended, as in Proust,
[he] found himself immured for life in a caste…
If you want to know what I think is gorgeous. This is. Gorgeous.