Walk-off Home Run

In baseball, a walk-off home run is a home run that ends the game. It must be a home run that gives the home team the lead (and consequently, the win) in the bottom of the final inning of the game. Thus the home team can "walk off" the field immediately afterward, rather than finishing the inning. It originally was directed to the pitcher, who had to "walk off" the field alone as the other team celebrated.