keep/hold your cards close to your chest idiom
对（计划等）守口如瓶，对（打算）秘而不宣
to keep your intended actions secret
You never quite know what Barry's going to do next - he keeps his cards very close to his chest. 你永远不太会知道巴里接下来会有什么举动——他总是守口如瓶。
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