sally port ( synonym found)
Definition of sally port:

(n) : a small door in a fort or a castle to enable a sally; a postern; an entryway controlled by two doors or gates, of which each must be closed before the other can open
Definition of sally port:

(n) : a small door in a fort or a castle to enable a sally; a postern; an entryway controlled by two doors or gates, of which each must be closed before the other can open
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