1. A line that marks the limits or extent of an area, territory, or property
The boundary line between the two countries runs through the river.
A linha divisória entre os dois países passa pelo rio.
2. A real or imaginary line that separates one region from another
The fence marks the boundary line of our property.
A cerca marca a linha divisória de nossa propriedade.
3. In sports, a line that defines the limits of the playing area
The ball went out of bounds beyond the boundary line.
A bola saiu da jogada além da linha divisória.