Definition of cloak-and-dagger adjective from the Oxford Advanced Learner's Dictionary

 

cloak-and-dagger

 adjective
adjective
BrE
 
; NAmE
 
[only before noun]
 
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cloak-and-dagger activities are secret and mysterious, sometimes in a way that people think is unnecessary or ridiculous Why can’t we be open about it? Do we really need all this cloak-and-dagger stuff?
See the Oxford Advanced American Dictionary entry: cloak-and-dagger