A dead drop is a hiding place where two people leave things for each other. Use a dead drop.
The whole point is that the two never meet, so neither can be seen with the other. A dead drop is marked as loaded by a chalk mark or a moved object nobody else would notice.
1noundead dropA hiding place where two people leave things for each other.
“The dead drop was a loose brick behind a bus shelter.”
dead drop is a place.
Practised in Spying & Secrecy