The word "sore" refers to a feeling of pain or discomfort in a part of the body. It can also describe a condition of being physically sensitive or tender due to injury, overuse, or illness. In a broader sense, "sore" can describe emotional or psychological pain, as well as something that is a source of distress or hurt feelings.
The word "sore" comes from the Old English "sāra," which means "painful" or "soreness." This root can be traced back further to the Proto-Germanic "sairaz" and Proto-Indo-European "ser-" which generally relates to the idea of pain or sorrow.