看美剧时候注意到这样的一个俚语：close to the vest。（《绝望的主妇》第一季第六集）
“'I'm not surprised he's playing it close to the vest.”
字幕的翻译是小心谨慎，守口如瓶。
该俚语的缘由：那时候的人们经常在外面穿件背心。我们知道扑克老手是绝对不会让任何人看到自己手里的牌的，所以他总是把手里的牌紧紧贴近自己的胸前，就是靠近背心的位置，也就是close to the vest，这样就没有人知道他手中的秘密了。
所以，close to the vest一直被用来指某人行事小心谨慎或者对某事严守机密。
例句1：He is a guy whom you could depend on because he can keep anything close to the vest.
例句2：I'm playing it close to the vest this time. I failed this time because too many people learned of my plans before I was ready to act.
I am playing it close to the vest now.
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