combat
verb intransitiveTo fight; to struggle or contend with an opposing force. Pardon me; I will not combat in my shirt. This word is particularly used to denote private contest, or the fighting of two persons in a duel; but it is used in a general sense for the contention of bodies of men, nations, armies, or any species of animals. After the fall of the republic, the Romans comabated only for the choice of maters.