What is a sideline in football?
A football field usually has specific boundaries. Most often, its size is 105×68 meters. However, sometimes, depending on the arena, these boundaries may slightly vary (though it is very rare). What is a sideline in soccer? This is a line that defines the vertical boundaries of the field. If a ball crosses it, it is considered that it left the lawn, and an out is appointed. It can have many other names in slang.
We’d also note that this definition is also used in other sports where the boundaries of an arena are clearly defined. What does sideline mean in football? It is a clear field layout that cannot be changed. In fact, its meaning implies that the boundaries where a ball and players can operate are limited. This is one of the basic elements of the game written down in the rules.