cloak-and-dagger

形容词 cloak-and-dagger:

1. conducted with or marked by hidden aims or methods
   同义词：clandestine, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground

cloak-and-dag.ger

adj.（形容词）
Marked by melodramatic intrigue and often espionage.
间谍的，惊险的：以戏剧性的阴谋为特征的，常常指间谍活动