be an open secret
成語所屬單字open
be an open secret — 慣用語
1. Something that many people know about even though it is supposed to be secret.
1.慣用語
釋義
公開的秘密
Something that many people know about even though it is supposed to be secret.
例句
The affair between the two actors was an open secret in Hollywood.
It is an open secret that the company is planning to merge.