The word "偿命" is formed as a verb-object compound where "偿" means to repay or compensate and "命" means life or fate. The character "偿" incorporates the radical "人" (person) alongside the component "尝" (derived from "賞", indicating reward), highlighting human agency in compensation. "命" combines "口" (mouth) and "令" (command), conveying life as something mandated. Together, they literally denote repaying with a life, used in contexts like retribution for causing death.