union jack

noun

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.

Origin of union jack

First recorded in 1665–75

Words nearby union jack

union catalogue, union church, union city, union day, union flag, union jack, union label, union language, union list, union of burma, union of south africa

Example sentences from the Web for union jack

British Dictionary definitions for union jack

Union Jack

noun

a common name for Union flag
(often not capitals) a national flag flown at the jackstaff of a vessel