noun
overtime; extra innings; extra time
Used in sports when a game is tied after regulation and continues into an additional period. The specific term varies by sport: overtime, extra innings (baseball), extra time (soccer).
試合は延長戦にもつれ込んだ。
The game went into extra innings.
延長戦の末、サヨナラホームランで決着がついた。
After extra innings, the game ended with a walk-off home run.