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

 

boo word

 noun
noun
BrE BrE//ˈbuː wɜːd//
 
; NAmE NAmE//ˈbuː wɜːrd//
 
(British English, informal)
 
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a word or expression for something that people dislike or disapprove of Elitism has become a boo word in education.