The phrase "a dead drop" is correct and usable in written English.
It is typically used in the context of espionage or covert operations to refer to a method of secretly leaving information or items for someone else to retrieve without direct contact.
Example: "The agent left the documents at a dead drop in the park, ensuring that no one would see them."
Alternatives: "a secret drop" or "a covert drop".
There was no evidence that Chung was attempting to make a dead drop.
The agent paid Nozette $11,000 for classified material, which was exchanged in recent weeks through a "dead drop" post office box, the FBI says.
What we call a dead drop -- often a tree in which secrets are left to be picked up by another agent -- is dubok, or "little oak".
For weeks, the agents following them wondered if the Maks were making a dead drop, but it turned out that the lumber section offered free coffee at that hour.
My daughter and I set up a "dead drop" of sorts — a secret place on school grounds where she could leave something for me that I would pick up later.
During the Cold War, C.I.A. officers in Russia carried out epic surveillance-detection runs, with American operatives travelling around Moscow for hours before making a dead drop to insure that they weren't being tailed.
The pair met at the Sandy Bottom Nature Park in Hampton, Va., and used a dead-drop location — a secret hole in the ground off a secluded hiking trail where each could leave materials for the other to find — to avoid law enforcement detection, according to the affidavit.
The resistance is given intelligence by an unidentified informant from the Cylon command structure, by use of a secret dead drop; flipping a dog bowl and hiding some documents inside the tent next to it.
Operation Roadside was a 2006 espionage case in Moscow that involved MI6 agents and their Russian assets who used an electronic dead drop disguised as a rock.
Whistle-blowers in possession of valuable and perhaps incriminating corporate and government information now had a global dead drop on the Web.
Intelligence officials have said in the past that some terrorist groups were using the method, which investigators call a "virtual dead drop".
