Union Jack

noun4

1. •
   The flag of the United Kingdom, consisting of the flags of England (St. George's Cross), Scotland (St. Andrew's Cross), and Ireland (St. Patrick's Cross, now only used in Northern Ireland) combined.
2. •
   (UK) The flag, consisting of the flags of England, Scotland, and Northern Ireland combined, flown on ships of the government of the United Kingdom.
3. •
   The British Empire.

   • Settlers already fearing the possibility of seeing their 1600, sometimes 1700 percent, profit margins stripped from them by London’s abolitionism saw no other option but to secede from the Union Jack. — 2019
4. •
   (US) The flag, consisting of the blue star-studded field in the corner of the national ensign, flown at the jackstaff by ships at anchor.