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, 不露聲色

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.
她總是守口如瓶,所以很難知道她在想什麼。
The company decided to keep its cards close to its chest about the new product launch.
公司決定對新產品發布守口如瓶