Definition of foul ball in US English:

foul ball

noun

Baseball
  • A ball struck so that it falls or will fall outside the lines extending from home plate past first and third bases. A foul ball that is not caught counts as a strike against the batter, unless it would be the third strike. The exception is a bunted foul ball, which can be a third strike.

    Compare with foul tip
    • ‘A foul ball and an outside pitch ran the count to 1 and 2.’
    • ‘My dad caught a foul ball in the third inning, and my dad's friend later took my brother down to the Yankees' dugout and had the ball autographed by the team.’
    • ‘White Sox hitters were consistently late on the fastball, hitting four foul balls in the inning.’
    • ‘The next batter, Adam Shorts, popped a foul ball down the first base line.’
    • ‘With one out in the ninth and the strikeout total at 25, the next batter hit a high foul ball between first and home plate.’

Pronunciation

foul ball

/faʊl bɔl/