The adhesion of a foreign material onto a surface, especially so as to reduce its functionality.

The state of being foul.

plural of foulness

(basketball) A foul committed by a member of the team with possession of the ball.

(baseball) An instance of fouling out. / (basketball) An instance of fouling out.

(baseball) To become out by hitting a foul ball which is caught. / (basketball) To be disqualified from further play for having committed too many fouls.

(baseball) A batted ball that lands in foul territory.

(baseball) a foul ball which glances off the bat and continues back with only a moderate change in direction

(baseball, slang, rare) A foul ball which just brushes by the bat, making a ticking sound.

Unfair, unethical, or criminal behavior, especially of a malicious or violent nature. / Any violation of rules.