Definition Of foul
(in sports) an unfair or invalid stroke or piece of play, especially one involving interference with an opponent.
It was a tough time for the French and Silvestre, having already been booked for a foul on Gillespie, just couldn't contain the winger in the 69th minute.
(in sports) commit a foul against (an opponent).
The keeper fouled his opponent but avoided a red card.
(of a ship) collide with or interfere with the passage of (another).
In The Edison  AC 449, the appellants, whose vessel had been fouled by the respondents, claimed damages under various heads.
a disease in the feet of cattle.
containing or charged with noxious matter; polluted.
foul, swampy water
Example Of foul
Afterwards he lay there, breathing the foul air as shallowly as he could.
As Shakespeare knew only too well, from foul deeds endless tragedy arises.
At least five homes in Moresby Close, Westlea, were swamped by up to six inches of foul water when a brook flooded and sewers burst during a recent downpour.
At rush hour the streets are plugged with cars producing vast quantities of toxic gases that foul the air.
Canvassing for the leadership contest degenerated into a vicious campaign in which all kinds of foul means including promise of office and bribery were resorted to.