Definition of Union Jack in English:

Union Jack

Syllabification: Un·ion Jack


1The national flag of the United Kingdom, consisting of red and white crosses on a blue background.
[originally a small British union flag flown as the jack of a ship; compare with union]
More example sentences
  • No chance of buying a Union Jack, Thai, Australian, Japanese, Scottish, Welsh, American, Korean or German flag now… sold out weeks ago.
  • Cheering crowds waving Union Jacks and the flag of Gurnard Sailing Club, where Shirley is a member, lined the route.
  • He also has a skull and crossbones which he hoists when his grandchildren visit, a Union Jack and a Yorkshire white rose - and he has no intention of getting rid of them.
2 (union jack) (In the US) a small flag consisting of the union from the national flag, flown at the bows of vessels in harbor.

Definition of Union Jack in: