cloak-and-dagger

Definitions of cloak-and-dagger
1

adj conducted with or marked by hidden aims or methods

cloak-and-dagger activities behind enemy lines”
Synonyms:
clandestine, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground
covert
secret or hidden; not openly practiced or engaged in or shown or avowed

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.