A tiebreaker is an event or situation that decides which team or person wins when there's no clear winner. This could be the final round of a competition.
In sports and games, especially those with multiple rounds, a tiebreaker often comes into play when the score is tied at the end. For example, in tennis, if two players are neck and neck after three sets, they might have to play an extra set – that's the tiebreaker. In some cases, it can be a sudden-death situation where one side has to come out on top right away. The idea is simple: it's a way to break the tie and declare a winner when all else fails.
Something that is used to pick a winner from a tied situation.
