cloak

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cloak-and-dagger

Using or involving secrecy, deception, or espionage, especially the kind portrayed in dramatic depictions of spying. During the Cold War, there were always rumors of the latest cloak-and-dagger tactics being used by spies. I know I said I wanted to meet you in private, but you didn't have to be so cloak-and-dagger about it. A parking garage isn't what I had in mind.

cloak (someone or something) in secrecy

To hide someone or something from another person or from public view. The residents complained that the board cloaked its decision process in secrecy, not allowing anyone to see the final plan.
See also: cloak, secrecy

cloak someone or something in secrecy

Fig. to hide or conceal someone or something in secrecy. Patrick cloaked his activities in secrecy. The agents cloaked the spy in secrecy, making her identity a mystery.
See also: cloak, secrecy

cloak-and-dagger

involving secrecy and plotting. A great deal of cloak-and-dagger stuff goes on in political circles. A lot of cloak-and-dagger activity was involved in the appointment of the director.

cloak-and-dagger

COMMON You use cloak-and-dagger to describe activities, especially dangerous ones, which are done in secret. Now that the Berlin Wall has come down, the cloak-and-dagger world of East-West espionage might appear to be outdated. They met in classic cloak-and-dagger style beside the lake in St James's Park. Note: You can refer to such activities as cloaks and daggers. Working in police intelligence has very little to do with cloaks and daggers — it's mostly about boring reports and endless statistics. Note: You sometimes use this expression to suggest that people are treating these activities in an unnecessarily dramatic way. Note: This expression is taken from the name of a type of 17th century Spanish drama, in which characters typically wore cloaks and fought with daggers or swords.
References in periodicals archive ?
In this instance, the cylindrical tube was cloaked with a shell of plasmonic metamaterial to make it appear invisible.
Results show that different from traditional cloak, the incident wave propagates through the reciprocal cloak and penetrates into the cloaked space.
One of such results is that a sensor can be cloaked in 2D electromagnetic waves, i.
For most of the other angles (scattering angle), the scattering cross section of the cloaked area is reduced by the aid of the designed cloak.
The holes must be smaller than the wavelength of the light--mere tens of nanometers across for visible light, the shortest wavelengths cloaked to date.
We compare the RCSs of bare PEC scatterer and cloaked one for different directions and polarizations of incoming waves.
After we placed the cloaked structure around the object we wanted to hide, the scattering or shadow effect was greatly reduced," Fang said.
The layers surround the object to be cloaked like an onion skin.
They have cloaked metal cylinders two to three inches in diameter and three to four inches high.
But charged particles wouldn't be fooled: They would interact with the cloak in a telltale way, giving up the cloaked object's location, researchers report in a paper to appear in Physical Review Letters.
Until now, however, cloaking techniques have come with a significant limitation--they need to be orders of magnitude larger than the object being cloaked.
Unlike the atoms and molecules that nature provides, which are limited in the combinations of electrical and magnetic permittivity and permeability, the novel metamaterials can mix and match E and g to provide exactly the radical refractive index variations that make light do loop-de-loops around a cloaked void, while obeying rules that would otherwise produce a straight route.
Washington, Nov 13 (ANI): Scientists from Karlsruhe Institute of Technology in Germany have developed software that may help know what a partially or completely cloaked object would look like in real life.
The invention sets a path for the realization of a practical invisibility cloak that not only makes an object disappear, but allows the cloaked object to see through the cloak, with the flick of a switch.
But with the cloaks, the light is reflected uniformly so that there is no shadow, and the cloaked surface appears flat.