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A batted ball that touches the ground outside of fair territory.
a baseball hit outside the foul lines.
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|Noun||1.||foul ball - (baseball) a ball struck with the bat so that it does not stay between the lines (the foul lines) that define the width of the playing field|
baseball, baseball game - a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs; "he played baseball in high school"; "there was a baseball game on every empty lot"; "there was a desire for National League ball in the area"; "play ball!"
foul - an act that violates the rules of a sport
fair ball - (baseball) a ball struck with the bat so that it stays between the lines (the foul lines) that define the width of the playing field