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Definition of boo

boo

/buː/
boo

Plural:boos
•
Past Simple:booed
•
Past Participle:booed
•
Present Participle:booing
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boo Lexical Profile

boo Game Scores & Validity

• interjection

1

Used to startle or frighten someone, often playfully.

Example

"She jumped out from behind the door and shouted, "Boo!""


2

Used to express loud disapproval, contempt, or derision, especially by a crowd at a public performance or sporting event.

Example

"The audience yelled "Boo!" when the referee made the controversial call."

• noun

1

An exclamation of disapproval, contempt, or derision made by a crowd or audience.

Example

"The visiting team entered the stadium to a chorus of loud boos."


2

A boyfriend, girlfriend, romantic partner, or close friend (informal slang, often used as a term of endearment).

Example

"She is spending the weekend traveling with her boo."

Synonyms
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Antonyms
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• verb

1

To shout "boo" to show disapproval, contempt, or derision toward a speaker, performer, or athlete.

Example

"The frustrated fans began to boo the players after their third consecutive loss."

Synonyms
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Antonyms
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• Rhymes for boo

Word Origin & Etymology

Originally an imitative interjection dating back to the 15th century, meant to startle someone or express contempt. The affectionate slang sense meaning a romantic partner emerged in African American Vernacular English in the late 20th century, likely influenced by the French 'beau' (admirer or sweetheart).

Cite this Entry


Wordmom. (2026). Definition of Boo. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/boo
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