Upfield is a term that is commonly used in sports like soccer or football to describe the area of the field that is closer to the opponent's goal. There are several synonyms that can be used in place of the term 'upfield'. One popular term is the 'forward zone', which refers to the area where players are likely to make forward passes or attempts on goal. Another synonym is 'attacking third' which is commonly used in soccer to describe the area of the field where the attacking team spends most of their time. In addition, the term 'offensive half' is often used to describe the section of the field closer to the opponent's goal. These synonyms can be used interchangeably with the term 'upfield' to describe the same area of the field.