Noun
the Glorious Twelfth
12 August, the start of the shooting season for red grouse, and to a lesser extent the ptarmigan, in Great Britain and Northern Ireland.
But the signs were last night that it could be a, almost, a Glorious Twelfth: news from the moors is that many moors don’t have what’s called a “shootable surplus” of grouse. Source: Internet
It is also known as the " Glorious Twelfth " in the United Kingdom, as it marks the traditional start of the grouse shooting season. Source: Internet