The word "sharp" can refer to something that has a fine edge or point that can cut easily, such as a knife. It can also describe a person who is intelligent or quick-witted. Additionally, "sharp" can refer to sounds that are piercing or high in pitch, or describe a sudden change in something, such as a sharp turn or sharp increase.
The word "sharp" comes from the Old English "scearp," which means "keen" or "acute." It is related to the Old Norse word "skarp," and the Proto-Germanic term "*skarwaz," which also means "cut" or "to cut."