1
- said suddenly to surprise someone who is unaware of one's presence呸：
'Boo!' she cried, jumping up to frighten him.
“呸！”她叫着, 跳起来吓唬他。
ORIGIN: probably an alteration of earlier bo, used in the same way since late Middle English.
2
- said to show disapproval or contempt嘘（表示不满或轻蔑）：
There's only one bar. 'Boo!'
只有一间酒吧。“嘘！”
- an utterance of 'boo' to show disapproval or contempt or speaker or performer（表示不满或轻蔑的）嘘声：
the audience greeted this comment with boos and hisses.
对这个评论, 观众报以嘘声。
verb
boos, booed
- say 'boo' to show disapproval or contempt of a speaker or performer发嘘声; 喝倒彩：
no obj. they booed and hissed when he stepped on stage当他上台时, 他们向他喝倒彩
with obj. the team were booed off the pitch.球队被嘘声轰下了场。
短语
wouldn't say boo to a goose（或 〈美〉not say boo）
- used to emphasize that someone is very shy or reticent非常羞怯; 沉默寡言。
词源