rout

The word rout carries the sense of complete defeat and collapse. It is most often used when one side is beaten so badly that it breaks apart and flees. In military writing, a rout is a crushing defeat followed by a disorderly retreat. As a verb, to rout someone is to defeat them utterly and drive them from their place or position.

You can also use it outside war. A sports team can be routed if it is beaten by a huge margin and seems helpless from start to finish. In a broader sense, the word can describe any situation where one side is overwhelmed and scattered. The central idea is not just loss, but loss with panic, confusion, or total collapse.

There is also an older noun sense found in historical or literary texts. In that use, a rout was a large fashionable gathering or evening party. That meaning is now rare, so most modern readers will understand rout as a severe defeat rather than a social event.

So whether it refers to a broken army, a one-sided game, or, in older books, a crowded party, rout suggests movement, pressure, and disorder. In modern English, though, its main job is to describe a heavy defeat that sends the loser falling apart.