名詞 howl:

1. a long loud emotional utterance
   同義詞：howling, ululation
2. the long plaintive cry of a hound or a wolf
3. a loud sustained noise resembling the cry of a hound

動詞 howl:

1. emit long loud cries
   同義詞：ululate, wail, roar, yawl, yaup
2. cry loudly, as of animals
   同義詞：wrawl, yammer, yowl
3. make a loud noise, as of wind, water, or vehicles
   同義詞：roar
4. laugh unrestrainedly and heartily
   同義詞：roar

1. The baby howled all night.
   那嬰兒哇哇地哭了一夜。
2. The dog howled over its master's body.
   狗對著主人的尸體哀嚎。

howl

v.（動詞）
howled,howl.ing,howls
v.intr.（不及物動詞）
To utter or emit a long, mournful, plaintive sound.
嚎叫，咆哮：發(fā)出悲傷，哀怨的長音
To cry or wail loudly, as in pain, sorrow, or anger.
哀號，嚎啕大哭：如因痛苦、悲傷或憤怒而大聲哭喊或哭泣
Slang To laugh heartily.
【俚語】 開心地狂笑
Slang To go on a spree.
【俚語】 狂歡
v.tr.（及物動詞）
To express or utter with a howl.See Synonyms at shout
哀號，吼叫：吼叫著說出，發(fā)出參見 shout
n.（名詞）
A long, wailing cry.
嚎哭
Slang Something uproariously funny or absurd.
【俚語】 極其可笑的事物，荒謬的事物

<常用詞組>howl down
To drown out or silence by loud derisive calls:
喝住，淹沒：以嘲弄的吼叫聲淹沒或使安靜：
例句：
The candidate was howled down at the town meeting.
在鎮(zhèn)上的集會中，候選人的聲音被嘲弄的喧嚷聲淹沒了

來源：
Middle English houlen
中古英語 houlen