Boo Definition

bo͝o
booed, booing, boos
noun
A sound uttered to show contempt, scorn, or disapproval.
American Heritage
Webster's New World
Any sound or word.
You never said boo to me about overtime.
American Heritage

(US, slang) A close acquaintance or significant other, derived from French beau.

Wiktionary
interjection
Used to express disapproval, scorn, etc.: a prolonged sound.
Webster's New World
Used to startle someone: an abrupt exclamation.
Webster's New World

An exclamation used by a member or many members of an audience, as at a stage play or sports game, to indicate derision or disapproval of what has just occurred.

Wiktionary
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verb
booed, booing, boos
To shout “boo” (at) in expressing disapproval.
Webster's New World
To express contempt, scorn, or disapproval of by booing.
Booed the singer off the stage.
American Heritage
Antonyms:
applaud
idiom
not say boo
  • to not make even the slightest comment or objection

    he didn't say boo all evening

Webster's New World

Other Word Forms of Boo

Noun

Singular:
boo
Plural:
boos

Idioms, Phrasal Verbs Related to Boo

  • not say boo

Origin of Boo

  • Coined to create a loud and startling sound. Compare Latin boō (“to cry aloud, roar, shout”).

    From Wiktionary

  • Origin unknown

    From American Heritage Dictionary of the English Language, 5th Edition

  • Imitative

    From American Heritage Dictionary of the English Language, 5th Edition

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