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English definition of “question tag”

question tag

noun [C]    
a short phrase such as 'isn't it' or 'don't you' that is added to the end of a sentence to check information or to ask if someone agrees with you: In the sentence, 'It's hot, isn't it?', 'isn't it' is a question tag.Question words and expressions
(Definition of question tag noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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