a jack consisting of the union of a national flag or ensign, as the U.S. jack, which has the white stars and blue field of the union of the U.S. national flag.
(often initial capital letter) the British national flag.
any flag the overall design of which is a union.
a common name for Union flag
(often not capitals) a national flag flown at the jackstaff of a vessel
First recorded in 1665–75
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
And yet, in a parallel world, it could have been the red, white and blue of the union jack flying in her honour, and not that of the French flag.
From BBC • Feb. 18, 2026
A growing number of St George's and union jack flags have appeared across England in recent months.
From BBC • Nov. 3, 2025
It gets to the heart of how many Britons' relationship with the union jack and the four nations' flags is complex.
From BBC • Aug. 23, 2025
For more than a mile, almost every one has a St George's or union jack flag attached - thousands of them.
From BBC • Aug. 23, 2025
The Shannon had her union jack at the foremast, and a somewhat faded blue ensign at the mizen peak.
From The Rise of Canada, from Barbarism to Wealth and Civilisation Volume 1 by Roger, Charles
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
