the.com/fighter jet

means A military aircraft built for speed and maneuverability, armed to engage and destroy other aircraft or ground targets.

from 'Fighter' traces to Old English 'feohtan,' to fight, a sturdy Germanic verb that's barely changed its job in a thousand years. 'Jet' comes from the French 'jeter,' to throw or spout — originally describing a jet of water or flame, the forceful gush that gave jet engines their name once 20th-century engineers worked out how to turn a controlled gush of exhaust into thrust. The two words only became a couple once jet propulsion matured enough, after WWII, to replace the propeller fighters that came before — making 'fighter jet' less an ancient phrase than a mid-20th-century marriage of an old warrior word to a new engineering one.