1. In sports, the defensive line or players positioned at the rear of the field/court
The back line needs to be stronger to prevent goals.
A linha de defesa precisa ser mais forte para evitar gols.
2. A line at the rear or back of something, such as a boundary or demarcation
The back line of the property is marked by the fence.
A linha traseira da propriedade é marcada pela cerca.
3. In rugby, the group of players behind the forward line
The back line executed a perfect play.
A linha de trás executou um jogo perfeito.