turn up trumps
出奇制胜；取得意外的成功或好结果
口语·描述出人意料的好结果
英文释义
to unexpectedly succeed or achieve a favorable outcome
例句
We were worried about the project, but she turned up trumps and finished it early.
典故来源
源自纸牌游戏中王牌（trump）获胜，比喻意外成功。