keep your cards close to your chest

US /kiːp jʊər kɑːrdz kloʊs tə jʊər tʃɛst/
UK /kiːp jʊər kɑːrdz kloʊs tə jʊər tʃɛst/
"keep your cards close to your chest" picture
1.

守口如瓶, 不露声色

to keep your plans, intentions, or feelings secret

:
She always keeps her cards close to her chest, so it's hard to know what she's thinking.
她总是守口如瓶,所以很难知道她在想什么。
The company decided to keep its cards close to its chest about the new product launch.
公司决定对新产品发布守口如瓶