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English definition of “boo”

boo

verb [I or T] uk   /buː/ (present participle booing, past tense and past participle booed) us  
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.Disapproving and criticizingDamaging reputation

boo

noun [C] uk   /buː/ (plural boos) us  
the act of booingDisapproving and criticizingDamaging reputation

boo

exclamation uk   /buː/ us  
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!"InterjectionsSounds used as interjections
(Definition of boo from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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