What does "vanquish" mean?

The term "vanquish" means to overpower an enemy completely, which is why the choice that highlights this definition is the correct answer. To vanquish someone or something implies a total defeat or conquest, often in a combative or competitive context. This word carries connotations of not just winning a battle but doing so decisively, ensuring that the opponent is effectively subdued and unable to continue fighting.

In contrast, the other options do not align with this meaning. Fleeing from battle implies an act of retreat rather than victory. Negotiating peace suggests a diplomatic approach rather than a direct confrontation, while allying with another indicates collaboration rather than overcoming or defeating an adversary. Each of these alternatives involves actions or strategies that do not convey the essence of total defeat that "vanquish" embodies.