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Union flag

noun
  1. the national flag of the United Kingdom, being a composite design composed of St George's Cross (England), Saint Andrew's Cross (Scotland), and Saint Patrick's Cross (Ireland)Often called: Union Jack
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012