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This type of message delivery was known as a "dead drop".

They claim to be seeing not fluctuations, but dead drops.

So, unless he was really hot for the chef at Giovanni's, even money it's a dead drop or a meet of some sort.

A website made for his 2010 hit, the dead drop.

Dan and I established a "dead drop" at a point on one of the walks we both had access to.

It seems like such a "drop dead" to the rest of us in the building.

I don't leave them laying around in a dead drop.

He leaves a fake message for superiors in a dead drop.

Following the instructions given to him in Moscow, he found the dead drop easily enough.

He then notes that they probably didn't get his dead drops.