Meaning of “boo” in the English Dictionary

"boo" in British English

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booverb [ I or T ]

uk /buː/ us /buː/ present participle booing, past tense and past participle booed

to make an expression of strong disapproval or disagreement:

People at the back started booing loudly.
Her singing was so bad that she was booed off the stage.

boonoun [ C ]

uk /buː/ us /buː/ plural boos

the act of booing

booexclamation

uk /buː/ us /buː/

(Definition of “boo” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"boo" in American English

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booverb [ I/T ]

us /bu/ present tense boos, present participle booing, past tense and past participle booed

boo verb [ I/T ] (DISAPPROVE)

to call out the word "boo" to express disapproval:

[ T ] They booed him off the stage.
boo
noun [ C ] us /bu/ plural boos

Students showed their dislike with a chorus of boos.

booexclamation

us /bu/

boo exclamation (SURPRISE)

used to surprise or frighten another person, and usually said loudly:

He snuck up behind me and said, "Boo!"

(Definition of “boo” from the Cambridge Academic Content Dictionary © Cambridge University Press)