keep your cards close to your chest
US /kiːp jʊər kɑːrdz kloʊs tə jʊər tʃɛst/
UK /kiːp jʊər kɑːrdz kloʊs tə jʊər tʃɛst/

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。