(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.

Alternative form of Foulness

(nautical) A wind blowing against the direction of travel.

(sports) An intentional foul, usually committed to prevent a scoring opportunity.

Although technically a breach of some code or law may have occurred, there was no actual damage meriting punishment, apology or retribution.

(intransitive, slang, idiomatic) To make a mistake, to go wrong. / (transitive) To botch; to make a mess of.