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    boo
    /buː/

    exclamation

    • 1. said suddenly to surprise someone who is unaware of one's presence: "‘Boo!’ she cried, jumping up to frighten him"
    • 2. said to show disapproval or contempt: "‘There's only one bar.’ ‘Boo!’"

    noun

    • 1. an utterance of ‘boo’ to show disapproval of a speaker or performer: "the audience greeted this comment with boos and hisses"

    verb

    • 1. say ‘boo’ to show disapproval of a speaker or performer: "they booed and hissed when he stepped on stage"

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