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uncountable
A sport in which high-performance off-road motorcycles are raced on an artificially made dirt track consisting of steep jumps and obstacles. quotations examples
In a 10-year career, he has won more A.M.A. supercross and motocross races than any rider in history.
2007 August 2, Matt Higgins, “Once Shunned, Freestylers to Meet Rivals”, in New York Times