Definition of the Glorious Twelfth from the Oxford Advanced Learner's Dictionary

     

    the Glorious Twelfth

     
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  1. 112 August, the first day of the season for shooting grouse (= a fat bird which is shot for sport and food) in Britain. Grouse shooting, especially on the Scottish moors, is very popular with rich people in Britain.
  2. 212 July, the anniversary of the Battle of the Boyne, which is celebrated by many Protestants in Northern Ireland. see also Orangeman