let the cat out of the bag
泄露秘密，意外地將某事公之于眾
口語(yǔ)·意外泄密
英文釋義
to reveal a secret or disclose information that was intended to be kept secret
例句
I was planning a surprise party, but my brother let the cat out of the bag.
典故來(lái)源
源自中世紀(jì)市場(chǎng)，騙子將貓冒充小豬裝入袋子出售，若貓跑出則騙局?jǐn)÷丁?/span>