The word 复仇 is formed by combining two conceptual ideas into a single, action-oriented unit. The first character, 复, carries the core meaning of "to return" or "to revert". The second character, 仇, represents "enmity", "hatred", or a "wrong" that demands redress. Together, they do not simply list these ideas but fuse them to create a new, specific concept: the act of "returning" or "responding to" a past enmity, thereby picturing the complete cycle of retaliation, the cause (the grievance) and the purposeful action (the answering act). It encapsulates the narrative of justifiable retaliation in a single, efficient compound.