foul pole

noun

, Baseball.

1. either of two poles, one on each foul line, being the vertical continuation of the outfield fence or wall, used by the umpire as a sight line in determining whether a fly ball hit near the foul line is a fair or foul ball.

Example Sentences

Altuve led off the game with a double, and he greeted reliever Drew Smyly by blasting a first-pitch curveball inside the left field foul pole.

From Washington Post

It was the lights between the third base line and left field foul pole at Nationals Park.

From Washington Post