dark horse
US /dɑrk hɔrs/
UK /dɑrk hɔrs/
1.
黑馬, 不為人知的人
a person who keeps their abilities and intentions secret and who surprises people by doing something unexpected, especially by winning a competition or election
:
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No one expected him to win; he was a real dark horse in the race.
沒人料到他會贏；他真是比賽中的一匹黑馬。
•
She's a bit of a dark horse; you never know what she's going to do next.
她有點像匹黑馬；你永遠不知道她下一步會做什麼。