noun
walk-off home run; game-ending home run
A home run that immediately ends the game because the home team takes the lead in the bottom of the last inning. Used in baseball contexts.
延長十二回裏、主将がサヨナラホームランを放った。
In the bottom of the 12th inning, the captain hit a walk-off home run.
あの試合はサヨナラホームランで劇的に終わった。
That game ended dramatically with a walk-off home run.