The word 伤害 (shānghài) is formed through a natural fusion of two characters with closely related meanings. The first character, 伤, primarily conveys the idea of a physical wound or injury. The second, 害, carries the broader sense of harm, damage, or a detrimental effect, often more abstract or general. By placing them together, the concept is created not by a grammatical rule, but by a semantic compounding where each character reinforces and expands upon the other, merging the specific notion of a physical wound with the wider concept of causing detriment to form the complete idea of "to injure" or "to harm" in both a physical and psychological sense.