Green’s Dictionary of Slang

greyhound racing.

1928		Daily Express 20 July 17/5: Greycing [...] tonight’s greyhound racing meetings .
1935		E.C. Ash Greyhound 141: The modern development, Greyhound Racing, or ‘Gracing’, as it is sometimes termed, started in 1926 .
2002		Canine Room 🌐 Interestingly, due to its reliance more on sight than smell, the greyhound dog is often referred to as the ‘gazehound’. Originally used in the chase, these canines are now used mainly for greyhound racing or ‘greycing’.