to cut: to physically sever something with a blade or tool
The word's most concrete use is simple cutting: felling a tree, trimming a branch, severing a head, cutting a cord. The object is always something that can be physically divided, and the context makes plain that a sharp instrument is at work.
This physical sense runs from the mundane (cutting wood for siege works or to heat an idol's forge) to the ceremonially charged (Zipporah's urgent cutting of her son's foreskin, the animals dismembered in covenant rites). It is also the semantic root that makes the other senses coherent: to cut off a person is to do to them what an ax does to a tree, and to make a covenant is to cut the sacrificial animals that seal it.