to fight, do battle, wage war
The dominant sense of this verb is armed conflict between people, armies, or nations. It covers everything from a skirmish between two fighters to a full-scale campaign in which one kingdom besieges another. The word is relentlessly concrete: it describes the act of fighting, not the cause or the outcome.
A notable theological use runs through Deuteronomy, Joshua, and the Psalms: Yahweh is said to fight (or to fight on behalf of his people), using the same word applied to armies. This is not a separate sense but the same combat vocabulary applied with a different subject. When Moses says "the LORD your God is the one who fights for you" (Deuteronomy 3:22), or when Jeremiah says "I will fight against you" on behalf of the Babylonians (Jeremiah 21:5), the verb carries identical weight. The divine and human uses share the same core meaning.
The word is almost always used in a form that frames the fighting as something two sides do to each other, which captures the sense of being engaged in combat, entering a fight, rather than merely striking a blow.