sally port

Noun

sally port (plural sally ports)

1. An opening into or entry to a fortification, usually arched, to enable a sally; a postern.
   • And so usually a trusted caporegime would be sent out to rent a secret apartment and fill it with mattresses. That apartment would be used as a sally port into the city when an offensive was mounted.1969, Mario Puzo, The Godfather, page 104
2. An entryway controlled by two doors or gates, each of which must be closed before the other can open.
   • “The prisoner will slide his bucket of shame over to the sally port. And the prisoner will be reminded not to make any sudden movements, lest he get the prod.” “I have a name.” “just slide your shit bucket over to Sally's port.” “Thank you.”2021 September 2, Paul Simms, “The Prisoner” (4:45 from the start), in What We Do in the Shadows, season 3, episode 1, spoken by Colin Robinson (Mark Proksch)