名詞 bellow:

1. a very loud utterance (like the sound of an animal)
   同義詞：bellowing, holla, holler, hollering, hollo, holloa, roar, roaring, yowl
2. United States novelist (born in Canada in 1915)
   同義詞：Saul Bellow

動詞 bellow:

1. shout loudly and without restraint
   同義詞：bawl
2. make a loud noise, as of animal
   同義詞：roar

1. The sergeant bellowed orders at the platoon.
   士官向全排士兵大聲地發(fā)出命令。
2. The music was so loud we had to bellow at each other to be heard.
   音樂的聲音實在太大，我們只有彼此大聲喊叫才能把話聽清。
3. The bull bellowed angrily.
   公牛怒吼起來。
4. He bellowed with pain when the tooth was pulled out.
   牙被拔掉時，他疼得大叫。

bel.low

v.（動詞）
bel.lowed,bel.low.ing,bel.lows
v.intr.（不及物動詞）
To make the deep roaring sound characteristic of a bull.
吼叫：發(fā)出象公牛般的低沉吼叫聲
To shout in a deep voice.
以低沉的聲音叫喊
v.tr.（及物動詞）
To utter in a loud, powerful voice.See Synonyms at shout
發(fā)出大而有力的聲音參見 shout
n.（名詞）
The roar of a large animal, such as a bull.
牛吼：大型動物的吼叫聲，如公牛
A very loud utterance or other sound.
大聲的發(fā)音或其他聲音

來源：
Middle English belwen
中古英語 belwen
perhaps from Old English belgan [to be enraged]
可能源自 古英語 belgan [被激怒的]
bylgan [to bellow]
bylgan [吼叫]

【引伸】
bel.lower
n.（名詞）