The word 报仇 is formed by combining two characters: 报 (bào), which carries the core meaning of "to repay" or "to require", and 仇 (chóu), which means "enmity", "hatred", or "a grievance". Conceptually, it directly links the action of "repaying" with the object of "enmity", creating the unified idea of settling a score or retaliating for a wrong. It’s a straightforward, cause-and-effect construction where one character denotes the action taken in direct response to the condition or object represented by the other.