dark horse 黑马（俚语）

英文释义

A person who is a little-known competitor in an election, race or similar contest.

例句

A majority of shareholders elected a dark horse as the company’s new CEO, rather than pick one of the better known and more flamboyant candidates.

多数股东选了一位黑马来担任公司的新任首席执行官，没有选一位更出名和派头更足的候选人。