A dark horse is a little-known person or thing that emerges to prominence, especially in a competition of some sort or a contestant that seems unlikely to succeed.
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Famous quotes containing the words dark and/or horse:
“Sometimes a neighbor whom we have disliked a lifetime for his arrogance and conceit lets fall a single commonplace remark that shows us another side, another man, really; a man uncertain, and puzzled, and in the dark like ourselves.”
—Willa Cather (1873–1947)
“At a tavern hereabouts the hostler greeted our horse as an old acquaintance, though he did not remember the driver.... Every man to his trade. I am not acquainted with a single horse in the world, not even the one that kicked me.”
—Henry David Thoreau (1817–1862)