(nautical) An anchor which has become entangled or caught up in something, or an image of this.

A foul anchor

(basketball) Any infraction of the rules penalized as a foul which does not involve physical contact during the course of play between players on the court, or is a foul by a nonplayer.

(basketball) A line from which a player takes a free throw / (baseball, softball) One of the two lines on the edge of a field marking the area inside which a fair ball may be hit.

(baseball) The area outside the playing field beyond the first base and third base lines, including the grandstand.

plural of foul ball

(sports) a breach of the rules in certain sports, particularly involving dangerous play.

plural of foul wind

(baseball) One of the two poles marking the area inside which a fair ball may be hit. It stands above a foul line.

plural of foul pole