名詞 boo:

1. a cry or noise made to express displeasure or contempt
   同義詞：hoot, Bronx cheer, hiss, raspberry, razzing, razz, snort, bird

動詞 boo:

1. show displeasure, as after a performance or speech
   同義詞：hiss

1. He won't defend us; he can't say boo to a goose.
   他不會幫我們說話的，他膽子很小(對一只鵝也不敢噓一聲)。
2. The Prime Minister's speech was greeted with boos and jeers.
   首相的演講遭喝倒彩。
3. The actors were booed off the stage.
   演員被倒彩聲轟下了臺。
4. You can hear the crowd booing.
   你可以聽到人群中的一片呸呸聲。

boo

n.（名詞）
【復(fù)數(shù)】 boos
A sound uttered to show contempt, scorn, or disapproval.
噓聲：表示輕視、嘲笑或反對的聲音
Informal Any sound or anything at all:
【非正式用語】 任何聲音或任何東西：
例句：
You never said boo to me about overtime.
你從沒對我提到加班的事

interj.（感嘆詞）
Used to express contempt, scorn, or disapproval or to frighten or surprise another.
噓：表示不滿、輕蔑、反對或嚇唬別人時發(fā)出的聲音
v.（動詞）
booed,boo.ing,boos
v.intr.（不及物動詞）
To utter a boo.
發(fā)出噓聲
v.tr.（及物動詞）
To express contempt, scorn, or disapproval of by booing:
噓（某人）：用噓聲表示不滿、蔑視或反對：
例句：
booed the singer off the stage.
把那個歌唱者噓下舞臺

來源：
[Imitative]
[象聲詞]

boo
boo 2

n.Slang （名詞）【俚語】
Marijuana.
大麻

來源：
[Origin unknown]
[來源不明]