What is Cloak ?
Cloak is (noun) 1. a long outer covering which hangs from the shoulders and has no sleeves She wore a long cloak of black velvet. 2. a cloak of secrecy something that hides things so that they remain secret The whole affair was shrouded in a cloak of secrecy. cloak and dagger referring to activities that suggest a mystery, or that someone is spying (informal.) under the cloak of darkness at night when everything is hidden They left the city under the cloak of darkness.(verb) to hide something in order to keep it secret The whole project is cloaked in secrecy. Antonym reveal
source: Easier English, Student Dictionary Upper Intermediate Level