- foul line - a line from which basketball players take penalty shots
--1 is a kind of line
--1 is a part of key, paint- foul line - a line across a bowling alley that a bowler must not cross
--2 is a kind of line
--2 is a part of bowling alley, alley, skittle alley- foul line - lines through 1st and 3rd base indicating the boundaries of a baseball field
--3 is a kind of line
--3 is a part of ball field, baseball field, diamond - foul line - a line across a bowling alley that a bowler must not cross