amateur race; unofficial race
Colloquial term for a race organized by amateurs or outside official sanctioning bodies, often in motorsports or cycling. The 草 prefix carries a 'grassroots' or 'makeshift' nuance.
An amateur race was held at the local circuit.
He went from amateur races to becoming a professional racer.
Compound of 草 (くさ, 'grass') + レース ('race'). The 草 prefix is used colloquially to mean 'grassroots', 'amateur', or 'unofficial', similar to English 'grassroots'.