cloak-and-dagger
adjective uk/ˌkləʊk.ənˈdæɡ.ər/ us/ˌkloʊk.ənˈdæɡ.ɚ/
（常指间谍、故事等）神秘离奇的，诡秘的
used to describe an exciting story involving secrets and mystery, often about spies, or something that makes you think of this
I'm tired of all these cloak-and-dagger (= secretive) meetings - let's discuss the issues openly. 这种神神秘秘的会议我受够了——我们公开讨论这些问题吧。
Synonyms: clandestine hush-hush secret surreptitiousundercover underground