Dark horse
Translation of "dark horse" into Russian
dark horse
темная лошадка
She was a dark horse in the competition, but she ended up winning.
Она была темной лошадкой в соревновании, но в итоге выиграла.
Definitions
A dark horse is a person or entity that is not well known or is underestimated but unexpectedly achieves success or prominence, often in a competitive context.