cloak

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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

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

cloak-and-dagger behaviour is when people behave in a very secret way, often when it is not really necessary
Usage notes: A cloak is a type of long, loose coat and a dagger is a small sharp knife used as a weapon. In 17th century Spanish theatre, cloak-and-dagger was worn by a dishonest character in the play.
(always before noun) Is all this cloak-and-dagger stuff necessary? Why can't we just meet in a café like everyone else?
References in periodicals archive ?
The size of the objects that can be efficiently cloaked with this method scales with the wavelength of operation, so when applied to optical frequencies, we may be able to efficiently stop the scattering of micrometer-sized objects," Alu said.
These cloaked antibodies can be used alone, or in conjunction with the many antibodies already produced against a wide variety of cancers.
Furthermore the 'perfect cloak' has to have a huge superstructure of two different sets of mirrors and is more than twice as wide as the region being cloaked.
Though heat isn't completely blocked, but only slowed, from dissipating into the cloaked area, Guenneau says there are potential applications for preventing materials from heating up too fast.
While previous studies have either been theoretical in nature or limited to the cloaking of two-dimensional objects, this new study by US researchers shows how ordinary objects can be cloaked in their natural environment in all directions and from all of an observer's positions.
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.
The layers surround the object to be cloaked like an onion skin.
Although the study cloaked a microscopic object roughly the diameter of a red blood cell, the device demonstrates that it may be "capable of cloaking any object underneath a reflective carpet layer.
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.
The group showed that both the physical geometry and the spectrographic signature of a chemical strip about the width of 10 human hairs disappeared when cloaked.
After we placed the cloaked structure around the object we wanted to hide, the scattering or shadow effect was greatly reduced," Fang said.
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.
Until now, however, cloaking techniques have come with a significant limitation--they need to be orders of magnitude larger than the object being cloaked.
They have cloaked metal cylinders two to three inches in diameter and three to four inches high.
The key is that electromagnetic waves still enter the cloaked area and hit the object--a requirement for an antenna to pick up a signal, for example.