noun
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.
地元のサーキットで草レースが開かれた。
An amateur race was held at the local circuit.
彼は草レースからプロのレーサーになった。
He went from amateur races to becoming a professional racer.