The word 身高 is formed by combining two independent characters, each contributing its core meaning to create a new, unified concept. The first character, 身, means "body" or "person", representing the entity being measured. The second character, 高, means "height" or "tall", representing the specific dimensional attribute. By placing them together, the compound directly and logically denotes "body height" or "a person's stature", merging the concept of the object (身) with its measurable quality (高).