foul line
noun(foul line)
either of two straight lines extending from the rear corner of home plate through the outer corners of first and third base respectively and prolonged to the boundary of a baseball field
foul line
noun(foul line)
a line across a bowling alley that a player must not step over when delivering the ball
foul line
noun(foul line)
either of two lines on a basketball court parallel to and 15 feet from the backboards behind which a player must stand while shooting a free throw