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A sound uttered to show contempt, scorn, or disapproval.
(noun)
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Informal Any sound or word: You never said boo to me about overtime.
(noun)
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Used to express contempt, scorn, or disapproval or to frighten or surprise another.
(interjection)
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To utter a boo.
(verb-intransitive)
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To express contempt, scorn, or disapproval of by booing: booed the singer off the stage.
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.