skin: the outer covering of a body, whether living skin on a person or animal or the hide and leather taken from a dead one
This is the ordinary word for skin, the layer that covers a body. The same word does duty for living skin and for what is left once an animal is dead, because both are the same thing seen at different stages: the integument that wraps flesh and bone. So it names the skin of a person, the hide of a beast, and the worked leather that hide becomes.
On a living body the word is vivid and physical. The Bible uses it for skin worn thin by suffering, for the skin that disease attacks, and for the unchangeable skin color of a person. Moses' face is described by its skin, which shone after he met God.
Off a living body the same word turns to what the skin becomes once removed. The first clothes God made were garments of skin. Hides covered the tabernacle, leather made a prophet's belt, and the skin of a sacrificed animal was either given to the priest or burned outside the camp with the rest of the carcass.
Two of the best known phrases in the Bible use this word as a stand-in for the body or life itself: Job's friend says a person will give skin for skin to save his own life, and Job says he has escaped with the skin of his teeth, that is, by the barest margin.