Meaning of horse race

horse' race"

Pronunciation: [key]
  1. a contest of speed among horses that either are ridden by jockeys or pull sulkies and their drivers.
  2. any formidable contest or competition: The primary election is expected to be a horse race among four opponents.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.