union jack

noun
|Updated on: 25 May 2018

Definition of union jack

1 : a jack consisting of the union of a national ensign
2 capitalized U&J : the state flag of the United Kingdom consisting of the union of the British national ensign

Recent Examples of union jack from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'union jack.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of union jack

1674

in the meaning defined at sense 1

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