2009, Mark Clapson,The Routledge Companion to Britain in the Twentieth Century, page332:
Greyhound racing had its origins in whippet racing, which was derived in turn from hare coursing. By the early twentieth century, however, a form of dog racing held in 'flapping tracks' was a common pastime in the wastelands near working-class areas of industrial cities.
2016, Gerald Hammond,The Language of Horse Racing, page81:
Flapping is racing which is not licensed by theJockey Club.[…] Anyone found participating in, or even attending,flapping races is liable to bewarned off.
2016, David Matthews,Man Buys Dog:
Flapping is the arse end of greyhound racing, the lowest of the low. Part sport, part fairground attraction,flapping is the bare-knuckle fighting of dog racing.
