a bird.-covered with, or containing, extraneous matter which is injurious, noxious, offensive, or obstructive; filthy; dirty; not clean; polluted; nasty; defiled; as, a foul cloth; foul hands; a foul chimney; foul air; a ship's bottom is foul when overgrown with barnacles; a gun becomes foul from repeated firing; a well is foul with polluted water.-scurrilous; obscene or profane; abusive; as, foul words; foul language.-hateful; detestable; shameful; odious; wretched.-loathsome; disgusting; as, a foul disease.-ugly; homely; poor.-not favorable; unpropitious; not fair or advantageous; as, a foul wind; a foul road; cloudy or rainy; stormy; not fair; -- said of the weather, sky, etc.-not conformed to the established rules and customs of a game, conflict, test, etc.; unfair; dishonest; dishonorable; cheating; as, foul play.-having freedom of motion interfered with by collision or entanglement; entangled; -- opposed to clear; as, a rope or cable may get foul while paying it out.-to make filthy; to defile; to daub; to dirty; to soil; as, to foul the face or hands with mire.-to incrust (the bore of a gun) with burnt powder in the process of firing.-to cover (a ship's bottom) with anything that impered its sailing; as, a bottom fouled with barnacles.-to entangle, so as to impede motion; as, to foul a rope or cable in paying it out; to come into collision with; as, one boat fouled the other in a race.-to become clogged with burnt powder in the process of firing, as a gun.-to become entagled, as ropes; to come into collision with something; as, the two boats fouled.-an entanglement; a collision, as in a boat race.-see foul ball, under foul, a.