snorkel box
 n.— «He said the dropoff mailbox, or “snorkel box,” in post office parlance, will be located at the back of the parking lot near Foley Street.» —“Attention, Santa: all Bristol Postmaster Mike Parent wants before Christmas is a new parking lot” by Jackie Majerus Bristol Press (Conn.) Oct. 14, 2005. (source: Double-Tongued Dictionary)

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