Meaning The 12th of August - the start of the British grouse shooting season.
Usage Britain.
Example
- Just two weeks to go. I've booked all the beaters and the trip to the grouse moor is all set - bring on the glorious twelfth.
Pronunciation
Idiom
The glorious twelfth
What does "The glorious twelfth" mean?
The 12th of August - the start of the British grouse shooting season.