boo definition, meaning - what is boo in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “boo”

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boo

verb [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.

boo

noun [C] uk   us   /buː/ (plural boos)
the act of booing

boo

exclamation 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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