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Definition of boo word noun from the Oxford Advanced Learner's Dictionary

boo word

noun
 
/ˈbuː wɜːd/
 
/ˈbuː wɜːrd/
(British English, informal)
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  1. a word or an expression for something that people dislike or think is bad
    • Elitism has become a boo word in education.
perfectly
adverb
 
 
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