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taboo

noun [C]
 
 
/təˈbuː/ (plural taboos)

Definition

(an action or word) avoided for religious or social reasons: In this society there is a taboo on/against any sort of public display of affection. For some people, death is a taboo subject.Forbidding and banning things
(Definition of taboo noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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