a contest of speed among horses that either are ridden by jockeys or pull sulkies and their drivers.
any formidable contest or competition: The primary election is expected to be a horse race among four opponents.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an organized sport, closely associated with gambling, in which riders race horses over dedicated courses, often incorporating hurdles.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012