A run-off is an extra vote or contest which is held in order to decide the winner of an election or competition, because no-one has yet clearly won.
例句
There will be a run-off between these two candidates on December 9th...12月9日将举行这两位候选人的决胜选举。He claimed the title after beating the American Sean Moran in a run-off at Bradford.他在布拉德福德的决胜赛中打败美国人肖恩·莫兰之后获得了冠军。
N-UNCOUNT
径流，溢流（指流入河流中的雨水）
Run-off is rainwater that forms a stream rather than being absorbed by the ground.