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- DictionaryBoo/bo͞o/
exclamation
- 1. said suddenly to surprise someone: "“Boo!” she cried, jumping up to frighten him"
- 2. said to show disapproval or contempt, especially at a performance or athletic contest: "“There's only one bar.” “Boo!”"
noun
- 1. an utterance of “boo” to show disapproval or contempt: "the audience greeted this comment with boos and hisses"
verb
- 1. say “boo” to show disapproval or contempt: "they booed and hissed when he stepped on stage"