sally port

Noun

 * 1) An opening into or entry to a fortification, usually arched, to enable a sally; a postern.
 * 2) An entryway controlled by two doors or gates, each of which must be closed before the other can open.
 * 1) An entryway controlled by two doors or gates, each of which must be closed before the other can open.

Translations

 * Russian: воро́та для вы́лазок