union jack

noun

1. 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.

2. (often initial capital letter),  the British national flag.

3. any flag the overall design of which is a union.

Union Jack

noun

1. a common name for Union flag

2. (often not capitals) a national flag flown at the jackstaff of a vessel

Word History and Origins

Origin of union jack¹

First recorded in 1665–75

Example Sentences

Protesters started to gather outside the Bell in the hours after the judgement - with several Union Jack and St George's flags being waved.

From BBC

St George's and Union Jack flags have been increasingly found lining streets across England.

From BBC

In recent weeks the Union Jack and St George's Cross have been hung in the Weoley Castle and Northfield areas of the city, which locals said they were doing in an act of patriotism.

From BBC

Even BMW-Mini, a mass market manufacturer, is more than willing to wave the Union Jack – or rather, have it painted on door mirrors and roofs.

From BBC

While wearing a stab-proof Union Jack vest, he used his set to highlight inequality in the justice system and the arts.

From BBC