The word 打劫 is formed by combining two characters whose individual meanings merge to create a new, specific concept. The first character, 打, originally depicts a hand striking and carries a broad sense of "to hit" or "to undertake an action". The second, 劫, conveys the idea of coercion, robbery, or a calamitous seizure. Together, they create a vivid conceptual image: the action (打) of forcibly seizing or robbing (劫), crystallizing into the modern meaning of "to commit robbery" or "to loot". It is a direct semantic compound where the combined visual and conceptual force of the two parts defines the whole.