decider
/dɪˈsaɪdə(r)/noun
1- a person or thing that decides or settles something, in particular决定者, 决定物, 尤指：
1.1
- in sing. Brit. a game or race that settles a series of contests between close competitors〈英〉决胜局, 决赛：
a tense promotion decider against Wolves.
与狼队进行的一场决定能否晋级的激烈比赛。
1.2
- in sing. Brit. a goal or point which settles the result of a game〈英〉决胜球, 决胜分。