halfback

The term "halfback" comes from older football systems in which players were named by where they stood. The quarterback was closest to the line, the halfbacks stood partway back, and the fullback stood deepest. This naming pattern appeared in rugby and then in American football, and it also shaped older soccer terms. So the word has a long sports history, even though people use it most often today in American football.

In modern American football, "halfback" usually means a running back, often the main ball carrier. This player takes handoffs, runs through the defense, catches passes out of the backfield, and sometimes helps with blocking. The terms "running back" and "tailback" are often used in similar ways. In formations such as the I-formation, the halfback may even line up behind the fullback, which shows how the old name stayed even after the positions moved.

The word can also appear in rugby, where a halfback is one of the backs who links parts of the team together, and in older soccer writing, where a halfback was a midfield-type player between the forwards and the fullbacks. Those uses are less common in everyday American English now, but they still matter if you read sports history or follow different football codes.

So when you see "halfback," the safest meaning is usually an American football running back. Still, the exact meaning depends on the sport and sometimes on the period of writing. In a modern game report, it likely points to a backfield runner. In a rugby discussion or an older soccer text, it points to a player working between the front line and the deeper defenders.