boo - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “boo”

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boo

verb [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.

boo

exclamation  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)
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