Meaning of the word "cloak and dagger" in English

What does "cloak and dagger" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

cloak and dagger

US /kloʊk ænd ˈdæɡər/
UK /kləʊk ænd ˈdæɡər/

Idiom

involving mystery, intrigue, and espionage, often with secret agents and clandestine activities

Example:
The novel was a thrilling tale of cloak and dagger in wartime Europe.
Their operations were always conducted with a sense of cloak and dagger.