「美剧口语」“保守秘密”用英语怎么说？

keep your mouth shut 闭嘴，保守秘密

All you have to do is just keeping your mouth shut.

你只要保守秘密就行了。

keep a secret 保密

I can tell you about it, but you have to keep a secret.

我可以告诉你这件事，但你必须保密。

keep to oneself 保守秘密

I kept your little secret to myself all these years.

你的这个小秘密我守了这么多年。

button up one's lip 守口如瓶，闭口不言

A: Did they find a way at last? 他们最后找到办法了吗?

B: Yes, they worked out a plan. 是的，他们制定出一项计划。

A: I'm most curious about what the plan is. 我很想知道是什么计划。

B: But they buttoned up their lips about it. 可他们对此守口如瓶。