wall: the upright side of a building, room, or object
Kir is the ordinary word for a wall thought of as the upright side of something built. It is the side of a house, the inner and outer walls of a room, the surface of the temple, or the side panels of an object like the incense altar. The picture is always a flat vertical face that encloses or bounds a space, the thing you stand against, lean on, write on, or that holds a structure up.
Because the wall is the surface closest at hand, it shows up wherever people touch the edges of their world. A donkey crushes a foot against it, a king turns his face to it to pray in private, mildew spreads across the inside of a house, blood is wiped against the side of the altar, and a hand of judgment writes on the plaster. In every case the wall is simply the side of the structure, named for what it bounds.
The word stays one idea across all of this. English keeps a single word too: it is a wall whether it belongs to a house, a temple, a room, or an altar. The variety in the verses comes from what is happening at the wall, not from the wall meaning different things.