gate·post
noun/ˈɡeɪtpəʊst/
/ˈɡeɪtpəʊst/
Idioms - a post to which a gate is attached or against which it is closed
门柱
Idioms
between you, me and the gatepost
- (British English, informal) used to show that what you are going to say next is a secret
（引出秘密）你我私下说，别对外人讲