[Burn Notice] Fair use rationale for Annie in Wonderland {Non-free media} ... A dead drop or dead letter box is a method of espionage tradecraft used to pass items between two individuals using a secret location and thus does not require them to meet directly. Using a dead drop permits a case officer and agent to exchange objects and information while maintaining operational security. The method stands in contrast to the li...
[n] - a drop used for the clandestine exchange of intelligence information
noun a drop used for the clandestine exchange of intelligence information; `a dead drop avoids the need for an intelligence officer and a spy to be present at the same time`
a prearranged secret spot where one espionage agent leaves a message or material for another agent to pick up.