set down v. phr. to crash a motorcycle while riding it by dropping from a vertical attitude into a horizontal slide. (source: Double-Tongued Dictionary)
Further reading
If you’re not using a dictionary to look up puzzling words as you read them, you’re missing out on a whole other level of enjoyment. • When you’re cleaning house, why not clean like there’s literally no tomorrow? The term...
Skid lid, cage, and backyard are all slang terms from the world of motorcycle enthusiasts. A skid lid is a helmet, a cage is an automobile, and a backyard is a favorite place to ride. The phrase lay it down means to have a motorcyle accident. This...