牛津电影里 100%
深藏不露的人
a person who does not tell other people much about their life, and who surprises other people by having interesting qualities
What a nice looking man. Who is he? You're a dark horse.
- Oh, he's a dark horse. - I wanted to keep you a secret.
释义来自《牛津高阶英汉双解词典》第 9 版