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Wiktionary
foul line

n. 1 (context basketball English) A line from which a player takes a free throw 2 (context baseball softball English) One of the two lines on the edge of a field marking the area inside which a fair ball may be hit. 3 (context bowling English) A line between the lane and the approach, which the bowler must not cross.

WordNet
foul line
  1. n. a line from which basketball players take penalty shots

  2. a line across a bowling alley that a bowler must not cross

  3. lines through 1st and 3rd base indicating the boundaries of a baseball field

Wikipedia
Foul line

In sports and games, foul line can refer to

Usage examples of "foul line".

Chuck retrieved the ball and then started to walk out toward the left of the foul line.

Natalie mumbled, and tried not to care as Ry approached the foul line.

He stood at the foul line, feet spread shoulder length,his eyes on the front rim.

Jake realized it was a playground basketball court even before he saw the boy at the far end, standing at the foul line and shooting baskets with a dusty old Wilson ball.

The Mexicans were squeezed under one tree, down the rightfield foul line, away from the rest of us.

The Mexicans were squeezed under one tree, down the right- field foul line, away from the rest of us.

He rebounded one of my shots, dribbled out past where the foul line had once been, and took a shot.

When the blue-shirts carrying chocks and chains had it secured, the tractor was unhooked and the nose tow-bar removed- In a few moments another tractor came aft from the bow towing the A-6Every that Jake and Reed were to man and parked it just short of the foul line on the port, or left, side of the landing area.

Yeager tossed his glove to the ground outside the foul line and trotted in to the chicken-wire cage that served for a dugout.