Origin of dead drop
see drop (noun)dead drop

MLA Style
"dead drop." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/dead-drop>.
APA Style
dead drop. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/dead-drop
(plural dead drops)
- (espionage) A location used to secretly pass items between two people, without requiring them to meet.
- drop dead
MLA Style
"dead drop." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/dead-drop>.
APA Style
dead drop. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/dead-drop