1. dead drop - Noun
2. dead drop - Verb
a drop used for the clandestine exchange of intelligence information
Source: WordNetdead-drop
a dead drop avoids the need for an intelligence officer and a spy to be present at the same time Source: Internet
Fans should now look at both Kraus's Ledger and the Wristwatch Containing Dead Drop List, paying special attention the cities and dates that are contained within. Source: Internet