a.

1. 肮脏的，污浊的
   The foul air is unfit to breathe.

   肮脏的空气不适宜呼吸。

2. 恶臭的；（食物）腐败的
3. 邪恶的，可恶的
4. 下流的，恶语咒骂的
   The guests were shocked by the boy's foul language.

   男孩的粗话使客人们感到震惊。

5. （天气等）恶劣的；（风）逆的
   The foul weather spoiled our vacation.

   恶劣的天气使我们的假期泡汤了。

6. （比赛中）犯规的[Z][B]
7. （水管等）堵塞的[Z]
   The chimney is foul.

   烟囱堵塞了。

8. （绳索等）被缠住的[Z]

ad.

1. 违反规则地；不正当地
   He played his opponent foul.

   他用不正当手段对待对手。

n.

1. （比赛中）犯规[C][（+against/on）]
   The footballer was cautioned for a foul on an opponent.

   那个足球运动员因对对手犯规而受到警告。

vt.

1. 弄脏；污染；玷污
   The smoke fouled the air.

   烟污染了空气。

2. 使堵塞
   Grease has fouled this drain.

   油污使这条下水道堵塞了。

3. 缠住
   The rope fouled the anchor.

   绳子把锚缠住了。

4. 碰撞

vi.

1. 腐败，腐烂
2. （管道等）堵塞[（+up）]
3. （比赛中）犯规
   The basketball player fouled again.

   那个篮球运动员又犯规了。

4. （绳索等）缠结

adj.

1. offensive to the senses.
   ▸informal very disagreeable or unpleasant.
   ▸(of the weather) wet and stormy.
2. morally offensive; wicked or obscene.
   ▸done contrary to the rules of a sport.
3. polluted or contaminated.
   ▸ (foul with) clogged or choked with.
   ▸Nautical  (of a rope or anchor) entangled.

n.

v.

1. make foul; pollute.
   ▸make dirty with excrement.
2. (in sport) commit a foul against.
3. (foul something up or foul up) make a mistake with or spoil something.
4. (of a ship) collide with or interfere with the passage of (another).
   ▸cause (a cable, anchor, etc.) to become entangled or jammed.