The word "切断" is formed through the direct semantic combination of its two constituent characters: "切", which means "to cut", and "断", which means "to sever or break". Their conceptual fusion creates a compound verb where the first character specifies the action (cutting) and the second character specifies the intended result of that action (a complete severance). Thus, the formation visually and conceptually depicts the process of cutting something to the point where it is completely separated or disconnected.