Meaning of “question tag” in the English Dictionary

british dictionary

"question tag" in British English

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question tagnoun [ C ]

uk /ˈkwes.tʃən ˌtæɡ/ us /ˈkwes.tʃən ˌtæɡ/

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.

(Definition of “question tag” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)