What is the meaning of Foul?

Covered with, or containing unclean matter; dirty.

Obscene, vulgar or abusive.

Detestable, unpleasant, loathsome.

Disgusting, repulsive; causing disgust.

Ugly; homely; poor.

Unpleasant, stormy or rainy.

Dishonest or not conforming to the established rules and customs of a game, conflict, test, etc.

Entangled and therefore restricting free movement, not clear.

(with "of") Positioned on, in, or near enough to (a specified area) so as to obstruct it.

Outside of the base lines; in foul territory.

To make dirty.

To besmirch.

To clog or obstruct.

To entangle.

To make contact with an opposing player in order to gain advantage.

To commit a foul.

To hit outside of the baselines.

To hit a ball outside of the baselines.

To become clogged.

To become entangled.

To come into contact or collide with.

A breach of the rules of a game, especially one involving inappropriate contact with an opposing player in order to gain an advantage; for example, tripping someone up in soccer, or contact of any kind in basketball.

A (usually accidental) contact between a bowler and the lane before the bowler has released the ball.

A foul ball, a ball which has been hit outside of the base lines.

to disqualify due to a foul (breach of rules of the game) or a violation

to eliminate

to reject (an idea or a proposal)

singular imperative of foulen

first-person singular present of foulen

Alternative form of fole (fool)

Alternative form of fowel

Source: wiktionary.org