boo Meaning, definition in Cambridge English Dictionary
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Meaning of "boo" - English Dictionary

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booverb [I or T]

uk   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   us   /buː/ (plural boos)
the act of booing

booexclamation

uk   us   /buː/
an expression, usually shouted, used to surprise and frighten someone who does not know you are near them : She jumped out of the cupboard and shouted "Boo!"
(Definition of boo from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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