dark horse
US /dɑrk hɔrs/
UK /dɑrk hɔrs/
1.
黑马, 不为人知的人
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.
没人料到他会赢；他真是比赛中的一匹黑马。
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She's a bit of a dark horse; you never know what she's going to do next.
她有点像匹黑马；你永远不知道她下一步会做什么。