Dark Horse
There is a custom among racing-men of training a horse in secret, or “keeping him dark,” so that his powers may be unknown to the betting world until the very day of the race.
Handy-book of Literary Curiosities by William S. Walsh, 1892.
There is a custom among racing-men of training a horse in secret, or “keeping him dark,” so that his powers may be unknown to the betting world until the very day of the race.
Handy-book of Literary Curiosities by William S. Walsh, 1892.