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
Farron's flag also featured a union jack in one corner.
From BBC • Sep. 20, 2025
As protesters gathered outside the hotel again on Friday evening with banners and union jack and England flags, feelings on the High Street were mixed.
From BBC • Aug. 29, 2025
"Greer!" he shouted, "go to the flag locker, get out a union jack and show our colors on the peak!"
From The Cruise of the Dry Dock by Stribling, T. S.
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.
