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boohai
boohoo
book
book cash
book club
book date
book-entry
book-entry security
book fair
book in
book learning
book lung
book of account
Book of Changes
Book of Common Prayer
book of final entry
book of hours
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boo

boo [ boo ]


interjection 
Definition:
 
1. expressing disapproval: used to express dissatisfaction or contempt, especially at a speaker or performer

2. used to startle somebody: used to surprise or startle somebody



noun  (plural boos)
Definition:
 
sound of disapproval or surprise: an utterance of "boo!" in order to startle somebody or to show dissatisfaction



transitive and intransitive verb  (past and past participle booed, present participle boo·ing, 3rd person present singular boos)
Definition:
 
express disapproval: to shout "boo!" in order to express dissatisfaction or contempt of somebody, especially a speaker or performer

[Early 19th century. Originally an imitation of a cow's lowing]

not say boo to be silent or reticent (informal)

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