boo Definition in the Cambridge English Dictionary
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Definition of “boo” - English Dictionary

Definition of "boo" - American English Dictionary

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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 ​expressdisapproval: [T] They booed him off the ​stage.
boo
noun [C]  us   /bu/ (plural boos)
Students ​showedtheirdislike 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)

Definition of "boo" - British 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 ​strongdisapproval 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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