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Definición 1
That which decides; notably heats or matches run or played to decide which horse, team, player, etc. goes through to the next round.
Fuente: Invertext
Contexto: Burnley's most famous supporter is Alastair Campbell, former director of communications and strategy for Tony Blair, now a blogger, political analyst, award-winning charity fundraiser and triathlete. "I feel so sorry for people who do not get football," he wrote on his blog recently after watching Burnley [football club] win through to Monday's decider [i.e. the match at Wembley to see which team goes through to the premier league].
Fuente: Financial Times 21/05/2009