Meaning of foul line

foul' line"

Pronunciation: [key]
  1. either of the two lines connecting home plate with first and third base respectively, or their continuations to the end of the outfield.
  2. Also calleda line on the court 15 ft. (4.6 m) from the backboard, from which foul shots are taken.
  3. a line on an alley at right angles to the gutters and 60 ft. (18.3 m) from the center of the spot for the headpin, across which a bowler may not step for fair delivery of the ball.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.