Definition of foul line in English:

foul line

noun

Baseball
  • Either of the straight lines extending from home plate down to the first and third bases and marking the limit of the playing area, within which a hit is deemed to be fair.

    • ‘A distance of 320 feet or more along the foul lines, and 400 feet or more to center field is preferable.’
    • ‘Ortiz's power from foul line to foul line makes him tough to pitch to.’
    • ‘He has ranged from left-center field to the third base foul line for balls.’
    • ‘The right field foul line was 247 feet, with a 12-foot fence and 40-foot high screen.’
    • ‘In 1936, Forbes Field featured a 300-foot right field foul line ending with a nine and one-half foot concrete wall, capped by an additional 18 feet of wire mesh.’

Pronunciation

foul line