dark horse
US /dɑrk hɔrs/
UK /dɑrk hɔrs/
1.
caballo oscuro, tapado
a person who keeps their abilities and intentions secret and who surprises people by doing something unexpected, especially by winning a competition or election
:
•
No one expected him to win; he was a real dark horse in the race.
Nadie esperaba que ganara; era un verdadero caballo oscuro en la carrera.
•
She's a bit of a dark horse; you never know what she's going to do next.
Es un poco un caballo oscuro; nunca sabes lo que va a hacer después.