The word "血迹" is formed by directly combining two meaningful characters: "血" (xuè), which means "blood", and "迹" (jì), which means "trace", "mark", or "stain". It is a straightforward, concept-driven compound where the first character identifies the substance and the second character describes its physical manifestation as a leftover mark. Together, they create a single, concrete image of a bloodstain, the visible trace left behind after blood has been shed or spilled.