Hold your cards close to the vest.

收好你的牌。

youdao

He is a trustworthy guy because he can keep anything close to the vest.

他是一个值得信赖的人，因为他可以做到对任何事守口如瓶。

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Big advertisers have kept the information they gather from their own campaigns close to the vest.

大型广告客户将从自己主办的活动中收集到的信息牢牢抓在手里。

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The technology company often keeps its products and ideas, close to the vest until as late as possible.

WSJ: Apple Moves Forward With TV Plans

"He keeps his cards close to the vest, so it's hard to tell what he's thinking, " he says.

NPR: Ex-Rocket Scientist To Oversee Financial Bailout

So Berkman took off, holding the stitched together passes close to the vest.

CNN: 'Hungry dog' eats, vomits up treasured Masters tickets