Which of the following Latin terms means "to fight"?

The Latin term that means "to fight" is indeed "pugno." This word is derived from the verb "pugnare," which directly translates to "to fight." It is frequently used in various contexts relating to combat or struggle. In classical texts, you might encounter "pugno" in reference to physical battles or metaphorical struggles, such as a fight for justice.

The other terms do not relate to fighting. "Laboro" translates to "to work," indicating effort or labor rather than combat. "Sum" means "to be," serving as an essential verb in Latin for existence or identity. "Amare," on the other hand, means "to love," demonstrating emotions rather than a physical confrontation. Therefore, "pugno" is the most accurate choice when asking for a term meaning "to fight."