Meaning of “Union Jack” in the English Dictionary

british dictionary

"Union Jack" in British English

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Union Jacknoun [ C usually singular ]

uk /ˌjuː.ni.ən ˈdʒæk/ us /ˌjuː.ni.ən ˈdʒæk/ also Union flag

the red, white, and blue flag of the UK:

The Chinese anthem was played after the Union Jack was lowered in Hong Kong for the last time.

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