Definition
in team sports, to engage in a game to determine the winning side
（团体运动中）加赛决胜负
The two teams will play off on Saturday to decide the champion.
这两支球队将在周六进行加赛以决定冠军。
In the playoffs, these two teams often play off to determine who advances to the finals.
在季后赛中，这两支球队经常进行加赛以决定谁能晋级决赛。
This match is considered a preview of the championship because their recent performances have been very close.
这场比赛被视为冠军赛的预演，因为他们最近的表现非常接近。