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Definition boo

Etymology 1

From earlier (15c.) boh, coined to create a loud and startling sound. Compare Middle English bus! (“bang!”, interjection), Latin bo? (“cry aloud, roar, shout”, verb), Ancient Greek ???? (boá?, “shout”, verb).

Interjection

boo

1. A loud exclamation intended to scare someone, especially a child. Usually used when one has been hidden from the victim and then suddenly appeared unexpectedly.
2. Used ironically in a situation where one had the opportunity to scare someone by speaking suddenly.
3. 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.

Noun

boo (plural boos)

1. A derisive shout made to indicate disapproval.

Verb

boo (third-person singular simple present boos, present participle booing, simple past and past participle booed)

1. (intransitive) To shout extended boos derisively.
2. (transitive) To shout extended boos at, as a form of derision.

Etymology 2

From beau.

Noun

boo (plural boos)

1. (US, African American Vernacular, slang) A close acquaintance or significant other.

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