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Definition of Boo
1. Verb. Show displeasure, as after a performance or speech.
Generic synonyms: Condemn
Antonyms: Applaud
Derivative terms: Hiss, Hiss, Hisser, Hissing
2. Noun. A cry or noise made to express displeasure or contempt.
Generic synonyms: Call, Cry, Outcry, Shout, Vociferation, Yell
Derivative terms: Hiss, Hiss, Hiss, Hoot, Razz, Snort
Definition of Boo
1. Interjection. 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. ¹
2. Interjection. A word used ironically in a situation where one might have scared someone, but said someone was not scared. Not said as loudly as in definition 1. ¹
3. Interjection. An exclamation used by a member of an audience, as at a stage play or sports game, to indicate derision or disapproval of what has just occurred. ¹
4. Noun. A derisive shout made to indicate disapproval. ¹
5. Noun. (US slang) A close acquaintance or significant other, derived from French beau. ¹
6. Verb. (intransitive) To shout extended boos derisively. ¹
7. Verb. (transitive) To derisively shout extended boos at. ¹
¹ Source: wiktionary.com
Definition of Boo
1. to cry "boo" [v -ED, -ING, -S]