Definition of walk-off in English:

walk-off

noun

Baseball
  • A run scored by the home team to gain the lead at the bottom of the final inning, thereby ending the game.

    ‘I like it so much when we win with a walk-off’
    • ‘a walk-off home run’
    • ‘He won the game in the 11th inning with a walk-off homer.’
    • ‘He gave up home runs to Dunn and Joe Randa, who hit a walk-off in his first game as a Red.’
    • ‘The Houston Astros ace reliever has now given up walk-off home runs in each of his last two appearances.’
    • ‘The previous fall, my interest was sparked again when Joe Carter hit the walk-off homer to win the World Series.’
    • ‘He will forever be a part of baseball lore because of his 11th inning walk-off shot, giving the Yankees a 6-5 win in Game 7 of the American League Championship Series.’