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Meaning of foul pole

foul' pole"

Pronunciation: [key]
— Baseball. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.