What does "foul" mean?

Additional senses

1. 2.2. Scurrilous; obscene or profane; abusive; as, foul words; foul language.
2. 3.Hateful; detestable; shameful; odious; wretched. "The foul with Sycorax." Shak. Who first seduced them to that foul revolt Milton.
3. 4.Loathsome; disgusting; as, a foul disease.
4. 5.Ugly; homely; poor. [Obs.] Chaucer. Let us, like merchants, show our foulest wares. Shak.
5. 6.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. So foul a sky clears not without a storm. Shak.
6. 7.Not conformed to the established rules and customs of a game, conflict, test, etc.; unfair; dishonest; dishonorable; cheating; as, foul play.
7. 8.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. Foul anchor. (Naut.) See under Anchor. -- Foul ball (Baseball), a ball that first strikes the ground outside of the foul ball lines, or rolls outside of certain limits. -- Foul ball lines (Baseball), lines from the home base, through the first and third bases, to the boundary of the field. -- Foul berth (Naut.), a berth in which a ship is in danger of fouling another vesel. -- Foul bill, or Foul bill of health, a certificate, duly authenticated, that a ship has come from a place where a contagious disorder prevails, or that some of the crew are infected. -- Foul copy, a rough draught, with erasures and corrections; -- opposed to fair or clean copy. "Some writers boast of negligence, and others would be ashamed to show their foul copies." Cowper. -- Foul proof, an uncorrected proof; a proof containing an excessive quantity of errors. -- Foul strike (Baseball), a strike by the batsman when any part of his person is outside of the lines of his position. -- To fall foul, to fall out; to quarrel. [Obs.] "If they be any ways offended, they fall foul." Burton. -- To fall, or run, foul of. See under Fall. -- To make foul water, to sail in such shallow water that the ship's keel stirs the mud at the bottom.
8. 9.To make filthy; to defile; to daub; to dirty; to soil; as, to foul the face or hands with mire.
9. 10.(Mil.) To incrust (the bore of a gun) with burnt powder in the process of firing.
10. 11.To cover (a ship's bottom) with anything that impered its sailing; as, a bottom fouled with barnacles.
11. 12.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.
12. 13.To become clogged with burnt powder in the process of firing, as a gun.
13. 14.To become entagled, as ropes; to come into collision with something; as, the two boats fouled.
14. 15.An entanglement; a collision, as in a boat race.
15. 16.(Baseball) See Foul ball, under Foul, a.