The word 救命 is formed by directly combining two meaningful characters: 救, which means "to rescue" or "to save", and 命, which means "life". It is a logical and intuitive compound where the first character denotes the action and the second character denotes the object of that action, creating the core concept of "saving a life". This direct fusion transforms the individual ideas into a single, urgent unit that functions both as a cry for help ("Help!") and as a verb meaning "to save someone's life".